diff --git a/backend/app/config.py b/backend/app/config.py
index da12998..49a48ae 100644
--- a/backend/app/config.py
+++ b/backend/app/config.py
@@ -159,10 +159,12 @@ class Settings(BaseSettings):
     bitget_api_secret: str = ""  # Bitget API Secret
     bitget_passphrase: str = ""  # Bitget API Passphrase
     bitget_use_testnet: bool = True  # 是否使用测试网（测试时设为 true）
+    bitget_use_unified_account: bool = True  # 使用统一账户(UTA)接口
 
     # 实盘风险控制（Bitget 实盘共用）
     bitget_max_single_position: float = 1000  # 单笔最大持仓金额 (USDT)
     bitget_max_total_leverage: float = 10     # 总杠杆上限（倍数）
+    bitget_default_leverage: int = 10         # 默认执行杠杆（启动时同步到交易对）
 
     # 账户级止损（所有平台通用）
     account_max_drawdown: float = 0.25  # 账户最大回撤（25%），超过则停止交易并平仓
diff --git a/backend/app/crypto_agent/crypto_agent.py b/backend/app/crypto_agent/crypto_agent.py
index bdbb67a..af36756 100644
--- a/backend/app/crypto_agent/crypto_agent.py
+++ b/backend/app/crypto_agent/crypto_agent.py
@@ -176,6 +176,12 @@ class CryptoAgent:
 
         # 配置
         self.symbols = self.settings.crypto_symbols.split(',')
+        if self.bitget:
+            sync_result = self.bitget.sync_default_leverage(
+                self.symbols,
+                leverage=self.settings.bitget_default_leverage
+            )
+            logger.info(f"Bitget 默认杠杆同步结果: {sync_result}")
 
         # 运行状态
         self.running = False
diff --git a/backend/app/crypto_agent/executor/bitget_executor.py b/backend/app/crypto_agent/executor/bitget_executor.py
index 449c122..0af82e2 100644
--- a/backend/app/crypto_agent/executor/bitget_executor.py
+++ b/backend/app/crypto_agent/executor/bitget_executor.py
@@ -22,11 +22,12 @@ class BitgetExecutor(BaseExecutor):
         """执行开仓"""
         try:
             symbol = decision.get('symbol', '').replace('USDT', '')
-            action = decision.get('action')  # buy/sell
+            action = decision.get('signal_action', decision.get('action'))  # buy/sell
             margin = decision.get('margin', decision.get('quantity', 0))
             entry_price = decision.get('entry_price', current_price)
             stop_loss = decision.get('stop_loss')
             take_profit = decision.get('take_profit')
+            leverage = min(decision.get('leverage', self.bitget.settings.bitget_default_leverage), 10)
 
             # 决定订单类型
             order_type, order_reason = self.decide_order_type(decision, current_price)
@@ -37,17 +38,19 @@ class BitgetExecutor(BaseExecutor):
             available = account_state.get('available_balance', 0)
             adjusted_margin = self.calculate_effective_margin(available, margin)
 
-            # 讣算合约张数
-            contracts = self._calculate_contracts(symbol, adjusted_margin, entry_price)
+            # 计算合约张数，必须与实际执行杠杆保持一致
+            contracts = self._calculate_contracts(symbol, adjusted_margin, entry_price, leverage)
 
             if contracts < 1:
                 return {
                     'success': False,
-                    'error': f'仓位计算结果 {contracts} 张，低于最小下单量'
+                    'error': (
+                        f'仓位计算结果 {contracts} 张，低于最小下单量 '
+                        f'(保证金=${adjusted_margin:.2f}, 杠杆={leverage}x)'
+                    )
                 }
 
             # 设置杠杆
-            leverage = min(decision.get('leverage', 5), 10)
             self.bitget.update_leverage(symbol, leverage)
 
             # 下单
@@ -319,14 +322,14 @@ class BitgetExecutor(BaseExecutor):
 
     # ==================== 辅助方法 ====================
 
-    def _calculate_contracts(self, symbol: str, margin: float, price: float) -> int:
+    def _calculate_contracts(self, symbol: str, margin: float, price: float, leverage: int) -> int:
         """计算合约张数"""
         try:
             # 获取合约规格
             contract_size = self.bitget.get_contract_size(symbol.replace('USDT', ''))
 
             # 计算持仓价值
-            position_value = margin * 5  # 假设 5x 杠杆
+            position_value = margin * leverage
 
             # 计算币数量
             coin_amount = position_value / price
@@ -334,7 +337,10 @@ class BitgetExecutor(BaseExecutor):
             # 计算合约张数（向下取整）
             contracts = int(coin_amount / contract_size)
 
-            logger.info(f"   仓位计算: ${margin:.2f} USD → {coin_amount:.6f} {symbol} → {contracts} 张")
+            logger.info(
+                f"   仓位计算: ${margin:.2f} × {leverage}x = ${position_value:.2f} "
+                f"→ {coin_amount:.6f} {symbol} → {contracts} 张"
+            )
 
             return contracts
 
diff --git a/backend/app/crypto_agent/executor/hyperliquid_executor.py b/backend/app/crypto_agent/executor/hyperliquid_executor.py
index 71d7f56..f96a033 100644
--- a/backend/app/crypto_agent/executor/hyperliquid_executor.py
+++ b/backend/app/crypto_agent/executor/hyperliquid_executor.py
@@ -21,7 +21,7 @@ class HyperliquidExecutor(BaseExecutor):
         """执行开仓"""
         try:
             symbol = decision.get('symbol', '').replace('USDT', '')
-            action = decision.get('action')  # buy/sell
+            action = decision.get('signal_action', decision.get('action'))  # buy/sell
             margin = decision.get('margin', decision.get('quantity', 0))
             entry_price = decision.get('entry_price', current_price)
             stop_loss = decision.get('stop_loss')
@@ -37,7 +37,7 @@ class HyperliquidExecutor(BaseExecutor):
             adjusted_margin = self.calculate_effective_margin(available, margin)
 
             # 计算仓位大小
-            leverage = min(decision.get('leverage', 5), 10)
+            leverage = min(decision.get('leverage', 10), 10)
             position_size = self._calculate_position_size(symbol, adjusted_margin, entry_price, leverage)
 
             if position_size <= 0:
diff --git a/backend/app/services/bitget_live_trading_service.py b/backend/app/services/bitget_live_trading_service.py
index e63c4e7..ff755fb 100644
--- a/backend/app/services/bitget_live_trading_service.py
+++ b/backend/app/services/bitget_live_trading_service.py
@@ -88,7 +88,8 @@ class BitgetLiveTradingService:
         usdt = balance.get('USDT', {})
         available = float(usdt.get('available', 0) or 0)
         frozen = float(usdt.get('frozen', 0) or 0)
-        account_value = available + frozen
+        equity = float(usdt.get('equity', 0) or 0)
+        account_value = equity if equity > 0 else (available + frozen)
 
         return {
             "account_value": account_value,
@@ -481,12 +482,49 @@ class BitgetLiveTradingService:
 
     # ==================== 杠杆 ====================
 
-    def update_leverage(self, symbol: str, leverage: int):
+    def update_leverage(self, symbol: str, leverage: int) -> bool:
         """设置杠杆倍数"""
         try:
-            self.trading_api.set_leverage(symbol, leverage)
+            return self.trading_api.set_leverage(symbol, leverage)
         except Exception as e:
             logger.warning(f"Bitget 设置杠杆失败: {symbol} {leverage}x: {e}")
+            return False
+
+    def sync_default_leverage(self, symbols: List[str], leverage: Optional[int] = None) -> Dict[str, Any]:
+        """将默认杠杆同步到一组交易对"""
+        target_leverage = int(leverage or self.settings.bitget_default_leverage or 10)
+        normalized_symbols = []
+        for symbol in symbols:
+            if not symbol:
+                continue
+            normalized = symbol.replace("/", "").strip().upper()
+            if normalized.endswith("USDT"):
+                normalized = normalized[:-4]
+            if normalized:
+                normalized_symbols.append(normalized)
+
+        if not normalized_symbols:
+            logger.info("Bitget 默认杠杆同步跳过：没有可用交易对")
+            return {"success": True, "leverage": target_leverage, "results": {}}
+
+        deduped_symbols = list(dict.fromkeys(normalized_symbols))
+        logger.info(f"开始同步 Bitget 默认杠杆: {target_leverage}x -> {deduped_symbols}")
+        results: Dict[str, bool] = {}
+        for symbol in deduped_symbols:
+            results[symbol] = self.update_leverage(symbol, target_leverage)
+
+        success = all(results.values()) if results else True
+        if success:
+            logger.info(f"Bitget 默认杠杆同步完成: {target_leverage}x")
+        else:
+            failed_symbols = [symbol for symbol, ok in results.items() if not ok]
+            logger.warning(f"Bitget 默认杠杆同步存在失败: {failed_symbols}")
+
+        return {
+            "success": success,
+            "leverage": target_leverage,
+            "results": results,
+        }
 
     # ==================== 辅助方法 ====================
 
diff --git a/backend/app/services/bitget_trading_api_sdk.py b/backend/app/services/bitget_trading_api_sdk.py
index f4360f7..6fe2f35 100644
--- a/backend/app/services/bitget_trading_api_sdk.py
+++ b/backend/app/services/bitget_trading_api_sdk.py
@@ -20,6 +20,9 @@ from app.utils.logger import logger
 class BitgetTradingAPI:
     """Bitget 实盘交易 API (基于 CCXT)"""
 
+    DEFAULT_PRODUCT_TYPE = 'USDT-FUTURES'
+    DEFAULT_MARGIN_COIN = 'USDT'
+
     def __init__(self, api_key: str, api_secret: str, passphrase: str = "", use_testnet: bool = True):
         """
         初始化 Bitget 交易 API
@@ -33,6 +36,9 @@ class BitgetTradingAPI:
         self.api_key = api_key
         self.api_secret = api_secret
         self.use_testnet = use_testnet
+        from app.config import get_settings
+        self.settings = get_settings()
+        self.use_unified_account = getattr(self.settings, 'bitget_use_unified_account', True)
 
         # 创建 CCXT Bitget 实例
         config = {
@@ -137,6 +143,7 @@ class BitgetTradingAPI:
                 'marginCoin': 'USDT',    # 保证金币种
                 'holdMode': 'oneWay',    # 单向持仓模式
             }
+            params = self._with_account_mode_params(params)
 
             if client_order_id:
                 params['clientOrderId'] = client_order_id
@@ -193,9 +200,9 @@ class BitgetTradingAPI:
             ccxt_symbol = self._standardize_symbol(symbol)
 
             if order_id:
-                self.exchange.cancel_order(order_id, ccxt_symbol)
+                self.exchange.cancel_order(order_id, ccxt_symbol, self._with_account_mode_params())
             elif client_order_id:
-                self.exchange.cancel_order_by_client_order_id(client_order_id, ccxt_symbol)
+                self.exchange.cancel_order_by_client_order_id(client_order_id, ccxt_symbol, self._with_account_mode_params())
             else:
                 logger.error("必须提供 order_id 或 client_order_id")
                 return False
@@ -222,7 +229,7 @@ class BitgetTradingAPI:
         """
         try:
             ccxt_symbol = self._standardize_symbol(symbol)
-            self.exchange.cancel_all_orders(ccxt_symbol)
+            self.exchange.cancel_all_orders(ccxt_symbol, self._with_account_mode_params())
 
             logger.info(f"✅ 撤销所有挂单成功: {symbol}")
             return True
@@ -303,6 +310,7 @@ class BitgetTradingAPI:
                 'tdMode': 'cross',
                 'marginCoin': 'USDT',
             }
+            params = self._with_account_mode_params(params)
 
             if price:
                 order = self.exchange.create_limit_order(
@@ -365,6 +373,7 @@ class BitgetTradingAPI:
                 'symbol': ccxt_symbol,
                 'trailingStopCallbackRate': callback_rate,
             }
+            params = self._with_account_mode_params(params)
 
             if activation_price:
                 params['trailingStopActivationPrice'] = activation_price
@@ -469,6 +478,7 @@ class BitgetTradingAPI:
                             'tdMode': 'cross',
                             'marginCoin': 'USDT',
                             'reduceOnly': True,  # 只平仓
+                            **self._with_account_mode_params(),
                         }
                     )
                     orders_created.append(('止损', sl_order))
@@ -491,6 +501,7 @@ class BitgetTradingAPI:
                             'tdMode': 'cross',
                             'marginCoin': 'USDT',
                             'reduceOnly': True,  # 只平仓
+                            **self._with_account_mode_params(),
                         }
                     )
                     orders_created.append(('止盈', tp_order))
@@ -533,9 +544,9 @@ class BitgetTradingAPI:
             ccxt_symbol = self._standardize_symbol(symbol)
 
             if order_id:
-                order = self.exchange.fetch_order(order_id, ccxt_symbol)
+                order = self.exchange.fetch_order(order_id, ccxt_symbol, self._with_account_mode_params())
             elif client_order_id:
-                order = self.exchange.fetch_order_by_client_order_id(client_order_id, ccxt_symbol)
+                order = self.exchange.fetch_order_by_client_order_id(client_order_id, ccxt_symbol, self._with_account_mode_params())
             else:
                 logger.error("必须提供 order_id 或 client_order_id")
                 return None
@@ -561,7 +572,7 @@ class BitgetTradingAPI:
         """
         try:
             ccxt_symbol = self._standardize_symbol(symbol) if symbol else None
-            orders = self.exchange.fetch_open_orders(ccxt_symbol)
+            orders = self.exchange.fetch_open_orders(ccxt_symbol, None, None, self._with_account_mode_params())
 
             logger.debug(f"查询到 {len(orders)} 个挂单")
             return orders
@@ -586,7 +597,7 @@ class BitgetTradingAPI:
         """
         try:
             ccxt_symbol = self._standardize_symbol(symbol)
-            orders = self.exchange.fetch_my_trades(ccxt_symbol, limit=limit)
+            orders = self.exchange.fetch_my_trades(ccxt_symbol, limit=limit, params=self._with_account_mode_params())
 
             logger.debug(f"查询到 {len(orders)} 条历史订单")
             return orders
@@ -612,7 +623,7 @@ class BitgetTradingAPI:
         """
         try:
             # 获取所有持仓
-            positions = self.exchange.fetch_positions()
+            positions = self.exchange.fetch_positions(None, self._with_account_mode_params())
 
             # 筛选非零持仓
             active_positions = []
@@ -691,17 +702,40 @@ class BitgetTradingAPI:
             余额信息 {USDT: {available: "...", frozen: "...", locked: "..."}}
         """
         try:
-            balance = self.exchange.fetch_balance()
-
-            # 转换为统一格式
-            result = {}
-            for currency, info in balance.get('total', {}).items():
-                if info and info > 0:  # 只返回有余额的币种
+            if self.use_unified_account:
+                response = self.exchange.privateUtaGetV3AccountAssets({
+                    'coin': self.DEFAULT_MARGIN_COIN,
+                })
+                assets = response.get('data', {}).get('assets', []) or []
+                result = {}
+                for entry in assets:
+                    currency = entry.get('coin')
+                    if not currency:
+                        continue
                     result[currency] = {
-                        'available': str(balance.get('free', {}).get(currency, 0)),
-                        'frozen': str(balance.get('used', {}).get(currency, 0)),
-                        'locked': '0'
+                        'available': str(entry.get('available', '0')),
+                        'frozen': str(entry.get('locked', '0')),
+                        'locked': str(entry.get('locked', '0')),
+                        'equity': str(entry.get('equity', entry.get('balance', '0'))),
                     }
+                logger.debug(f"账户余额: {result}")
+                return result
+
+            response = self.exchange.privateMixGetV2MixAccountAccounts({
+                'productType': self.DEFAULT_PRODUCT_TYPE,
+            })
+
+            result = {}
+            for entry in response.get('data', []) or []:
+                currency = entry.get('marginCoin')
+                if not currency:
+                    continue
+                result[currency] = {
+                    'available': str(entry.get('available', '0')),
+                    'frozen': str(entry.get('locked', '0')),
+                    'locked': str(entry.get('locked', '0')),
+                    'equity': str(entry.get('accountEquity', entry.get('usdtEquity', '0'))),
+                }
 
             logger.debug(f"账户余额: {result}")
             return result
@@ -721,8 +755,13 @@ class BitgetTradingAPI:
             账户信息
         """
         try:
-            balance = self.exchange.fetch_balance()
-            return balance
+            if self.use_unified_account:
+                return self.exchange.privateUtaGetV3AccountAssets({
+                    'coin': self.DEFAULT_MARGIN_COIN,
+                })
+            return self.exchange.privateMixGetV2MixAccountAccounts({
+                'productType': self.DEFAULT_PRODUCT_TYPE,
+            })
         except ccxt.BaseError as e:
             logger.error(f"❌ 查询账户信息失败: {e}")
             return {}
@@ -743,10 +782,24 @@ class BitgetTradingAPI:
             是否成功
         """
         try:
-            ccxt_symbol = self._standardize_symbol(symbol)
+            if self.use_unified_account:
+                response = self.exchange.privateUtaPostV3AccountSetLeverage({
+                    'symbol': self._to_contract_symbol_id(symbol),
+                    'coin': self.DEFAULT_MARGIN_COIN,
+                    'category': self.DEFAULT_PRODUCT_TYPE,
+                    'leverage': str(leverage),
+                })
+            else:
+                response = self.exchange.privateMixPostV2MixAccountSetLeverage({
+                    'symbol': self._to_contract_symbol_id(symbol),
+                    'marginCoin': self.DEFAULT_MARGIN_COIN,
+                    'productType': self.DEFAULT_PRODUCT_TYPE,
+                    'leverage': str(leverage),
+                })
 
-            # CCXT 设置杠杆
-            self.exchange.set_leverage(leverage, ccxt_symbol)
+            if response.get('code') != '00000':
+                logger.error(f"❌ 设置杠杆失败: {response}")
+                return False
 
             logger.info(f"✅ 设置杠杆成功: {symbol} {leverage}x")
             return True
@@ -784,6 +837,22 @@ class BitgetTradingAPI:
         # 例如：BTC -> BTC/USDT:USDT
         return f"{symbol}/USDT:USDT"
 
+    def _to_contract_symbol_id(self, symbol: str) -> str:
+        """转成 Bitget U 本位合约 symbol id，例如 BTCUSDT"""
+        normalized = symbol.strip().upper()
+        if '/' in normalized:
+            base = normalized.split('/')[0]
+            return f"{base}USDT"
+        if ':' in normalized:
+            normalized = normalized.split(':')[0]
+        return normalized if normalized.endswith('USDT') else f"{normalized}USDT"
+
+    def _with_account_mode_params(self, params: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
+        merged = dict(params or {})
+        if self.use_unified_account:
+            merged['uta'] = True
+        return merged
+
     def _get_contract_size(self, symbol: str) -> float:
         """
         获取合约面值（每张合约对应的币数量）
diff --git a/backend/tests/test_bitget_live_trading_service.py b/backend/tests/test_bitget_live_trading_service.py
index e9b1086..dc875e7 100644
--- a/backend/tests/test_bitget_live_trading_service.py
+++ b/backend/tests/test_bitget_live_trading_service.py
@@ -75,6 +75,14 @@ class TestGetAccountState:
         assert state['available_balance'] == pytest.approx(8000.0)
         assert state['total_margin_used'] == pytest.approx(2000.0)
 
+    def test_equity_preferred_when_present(self):
+        service, mock_api = make_service()
+        mock_api.get_balance.return_value = {
+            'USDT': {'available': '8000.0', 'frozen': '2000.0', 'locked': '2000.0', 'equity': '10500.0'}
+        }
+        state = service.get_account_state()
+        assert state['account_value'] == pytest.approx(10500.0)
+
     def test_usdt_not_present(self):
         service, mock_api = make_service()
         mock_api.get_balance.return_value = {}
@@ -105,6 +113,12 @@ class TestGetOpenPositions:
     def _make_raw_position(self, coin='BTC', contracts=1.0, side='long',
                             entry_price=50000.0, pnl=100.0, leverage=10,
                             liq_price=45000.0):
+        contract_sizes = {
+            'BTC': 0.01,
+            'ETH': 0.1,
+            'SOL': 1.0,
+        }
+        available = contracts * contract_sizes.get(coin, 1.0)
         return {
             'symbol': f'{coin}/USDT:USDT',
             'contracts': contracts,
@@ -113,6 +127,7 @@ class TestGetOpenPositions:
             'unrealizedPnl': pnl,
             'leverage': leverage,
             'liquidationPrice': liq_price,
+            'info': {'available': str(available)},
         }
 
     def test_long_position(self):
@@ -189,6 +204,7 @@ class TestGetPositionForSymbol:
             'unrealizedPnl': 0.0,
             'leverage': 10,
             'liquidationPrice': 45000.0,
+            'info': {'available': '0.01'},
         }]
         pos = service.get_position_for_symbol('BTC')
         assert pos is not None
@@ -210,6 +226,7 @@ class TestGetPositionForSymbol:
             'unrealizedPnl': 0.0,
             'leverage': 5,
             'liquidationPrice': 2500.0,
+            'info': {'available': '0.5'},
         }]
         pos = service.get_position_for_symbol('ETHUSDT')
         assert pos is not None
@@ -529,6 +546,7 @@ class TestCheckRiskLimits:
             'unrealizedPnl': 0.0,
             'leverage': 10,
             'liquidationPrice': 50000.0,
+            'info': {'available': '2'},
         }]
         result = service.check_risk_limits()
         assert result['allowed'] is False
@@ -718,15 +736,16 @@ class TestMarketCloseAll:
             'unrealizedPnl': 0.0,
             'leverage': 10,
             'liquidationPrice': 45000.0,
+            'info': {'available': '0.02'},
         }]
-        mock_api.exchange.create_order.return_value = {'id': 'close1', 'status': 'closed'}
+        mock_api.exchange.create_market_order.return_value = {'id': 'close1', 'status': 'closed'}
 
         result = service.market_close_all()
         assert result['success'] is True
         assert len(result['results']) == 1
         # 多仓平仓用 sell
-        call_args = mock_api.exchange.create_order.call_args
-        assert call_args[1].get('side') or call_args[0][2] == 'sell'
+        kwargs = mock_api.exchange.create_market_order.call_args.kwargs
+        assert kwargs['side'] == 'sell'
 
     def test_close_single_short(self):
         """单个空仓：发出 buy 方向的市价单"""
@@ -739,24 +758,25 @@ class TestMarketCloseAll:
             'unrealizedPnl': 0.0,
             'leverage': 5,
             'liquidationPrice': 3500.0,
+            'info': {'available': '0.5'},
         }]
-        mock_api.exchange.create_order.return_value = {'id': 'close2', 'status': 'closed'}
+        mock_api.exchange.create_market_order.return_value = {'id': 'close2', 'status': 'closed'}
 
         result = service.market_close_all()
         assert result['success'] is True
-        call_args = mock_api.exchange.create_order.call_args
-        assert call_args[1].get('side') or call_args[0][2] == 'buy'
+        kwargs = mock_api.exchange.create_market_order.call_args.kwargs
+        assert kwargs['side'] == 'buy'
 
     def test_close_multiple_positions(self):
         """多个持仓，全部成功"""
         service, mock_api = make_service()
         mock_api.get_position.return_value = [
             {'symbol': 'BTC/USDT:USDT', 'contracts': 1.0, 'side': 'long',
-             'entryPrice': 50000.0, 'unrealizedPnl': 0.0, 'leverage': 10, 'liquidationPrice': None},
+             'entryPrice': 50000.0, 'unrealizedPnl': 0.0, 'leverage': 10, 'liquidationPrice': None, 'info': {'available': '0.01'}},
             {'symbol': 'ETH/USDT:USDT', 'contracts': 3.0, 'side': 'short',
-             'entryPrice': 3000.0, 'unrealizedPnl': 0.0, 'leverage': 5, 'liquidationPrice': None},
+             'entryPrice': 3000.0, 'unrealizedPnl': 0.0, 'leverage': 5, 'liquidationPrice': None, 'info': {'available': '0.3'}},
         ]
-        mock_api.exchange.create_order.return_value = {'id': 'x', 'status': 'closed'}
+        mock_api.exchange.create_market_order.return_value = {'id': 'x', 'status': 'closed'}
 
         result = service.market_close_all()
         assert result['success'] is True
@@ -775,35 +795,36 @@ class TestMarketCloseAll:
         service, mock_api = make_service()
         mock_api.get_position.return_value = [
             {'symbol': 'BTC/USDT:USDT', 'contracts': 1.0, 'side': 'long',
-             'entryPrice': 50000.0, 'unrealizedPnl': 0.0, 'leverage': 10, 'liquidationPrice': None},
+             'entryPrice': 50000.0, 'unrealizedPnl': 0.0, 'leverage': 10, 'liquidationPrice': None, 'info': {'available': '0.01'}},
             {'symbol': 'ETH/USDT:USDT', 'contracts': 3.0, 'side': 'long',
-             'entryPrice': 3000.0, 'unrealizedPnl': 0.0, 'leverage': 5, 'liquidationPrice': None},
+             'entryPrice': 3000.0, 'unrealizedPnl': 0.0, 'leverage': 5, 'liquidationPrice': None, 'info': {'available': '0.3'}},
         ]
         # 第一次下单成功，第二次失败
-        mock_api.exchange.create_order.side_effect = [
+        mock_api.exchange.create_market_order.side_effect = [
             {'id': 'ok1', 'status': 'closed'},
             Exception("rate limit"),
         ]
         result = service.market_close_all()
         assert result['success'] is False
 
-    def test_position_too_small_skipped(self):
-        """持仓量小于 1 张时跳过，不报错"""
+    def test_position_above_min_coin_amount_is_closed(self):
+        """只要币数量高于最小下单精度，就应允许平仓"""
         service, mock_api = make_service()
-        # BTC 合约面值 0.01，持仓 0.005 BTC → 0 张 → 跳过
+        mock_api.exchange.create_market_order.return_value = {'id': 'close-small', 'status': 'closed'}
         mock_api.get_position.return_value = [{
             'symbol': 'BTC/USDT:USDT',
-            'contracts': 0.5,   # 0.5张 × 0.01 = 0.005 BTC → floor(0.005/0.01) = 0张
+            'contracts': 0.5,
             'side': 'long',
             'entryPrice': 50000.0,
             'unrealizedPnl': 0.0,
             'leverage': 10,
             'liquidationPrice': None,
+            'info': {'available': '0.005'},
         }]
         result = service.market_close_all()
         assert result['success'] is True
-        assert result['results'] == []
-        mock_api.exchange.create_order.assert_not_called()
+        assert len(result['results']) == 1
+        mock_api.exchange.create_market_order.assert_called_once()
 
 
 # ==================== TestInitializeAccount ====================
diff --git a/backend/tests/test_bitget_trading_api_sdk_unit.py b/backend/tests/test_bitget_trading_api_sdk_unit.py
new file mode 100644
index 0000000..dd43f80
--- /dev/null
+++ b/backend/tests/test_bitget_trading_api_sdk_unit.py
@@ -0,0 +1,88 @@
+"""
+BitgetTradingAPI 单元测试
+
+覆盖重点：
+  - U 本位账户余额固定走 mix account 接口
+  - 杠杆设置固定走 mix set-leverage 接口
+"""
+import importlib.util
+import os
+import sys
+import types
+from pathlib import Path
+from unittest.mock import MagicMock
+
+
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))
+
+
+def load_bitget_sdk_class():
+    sdk_path = Path(__file__).resolve().parents[1] / 'app' / 'services' / 'bitget_trading_api_sdk.py'
+
+    if 'ccxt' not in sys.modules:
+        ccxt_module = types.ModuleType('ccxt')
+        ccxt_module.BaseError = Exception
+        ccxt_module.bitget = MagicMock()
+        sys.modules['ccxt'] = ccxt_module
+
+    module_name = 'app.services.bitget_trading_api_sdk_test'
+    spec = importlib.util.spec_from_file_location(module_name, sdk_path)
+    module = importlib.util.module_from_spec(spec)
+    sys.modules[module_name] = module
+    spec.loader.exec_module(module)
+    return module.BitgetTradingAPI
+
+
+def test_get_balance_uses_usdt_futures_account_endpoint():
+    BitgetTradingAPI = load_bitget_sdk_class()
+    api = BitgetTradingAPI.__new__(BitgetTradingAPI)
+    api.exchange = MagicMock()
+    api.use_unified_account = True
+    api.exchange.privateUtaGetV3AccountAssets.return_value = {
+        'code': '00000',
+        'data': {
+            'assets': [
+                {
+                    'coin': 'USDT',
+                    'available': '123.45',
+                    'locked': '6.78',
+                    'equity': '130.23',
+                }
+            ],
+        },
+    }
+
+    balance = api.get_balance()
+
+    api.exchange.privateUtaGetV3AccountAssets.assert_called_once_with({
+        'coin': 'USDT',
+    })
+    assert balance == {
+        'USDT': {
+            'available': '123.45',
+            'frozen': '6.78',
+            'locked': '6.78',
+            'equity': '130.23',
+        }
+    }
+
+
+def test_set_leverage_uses_mix_contract_endpoint():
+    BitgetTradingAPI = load_bitget_sdk_class()
+    api = BitgetTradingAPI.__new__(BitgetTradingAPI)
+    api.exchange = MagicMock()
+    api.use_unified_account = True
+    api.exchange.privateUtaPostV3AccountSetLeverage.return_value = {
+        'code': '00000',
+        'msg': 'success',
+    }
+
+    success = api.set_leverage('BTC', 10)
+
+    assert success is True
+    api.exchange.privateUtaPostV3AccountSetLeverage.assert_called_once_with({
+        'symbol': 'BTCUSDT',
+        'coin': 'USDT',
+        'category': 'USDT-FUTURES',
+        'leverage': '10',
+    })
diff --git a/backend/tests/test_execution_safety_fixes.py b/backend/tests/test_execution_safety_fixes.py
index 9e66d2e..0ce303e 100644
--- a/backend/tests/test_execution_safety_fixes.py
+++ b/backend/tests/test_execution_safety_fixes.py
@@ -127,6 +127,7 @@ def test_bitget_executor_close_uses_symbol_close_not_close_all():
 
     executor = BitgetExecutor.__new__(BitgetExecutor)
     executor.bitget = MagicMock()
+    executor.bitget.settings.bitget_default_leverage = 10
     executor.send_execution_notification = AsyncMock()
     executor.bitget.market_close_position.return_value = {'success': True, 'coin': 'BTC'}
 
@@ -156,3 +157,39 @@ def test_bitget_executor_move_stop_loss_uses_set_tp_sl():
         tp_price=55000.0,
         sl_price=49000.0,
     )
+
+
+def test_bitget_executor_open_uses_actual_leverage_for_contracts():
+    BitgetExecutor = load_bitget_executor_class()
+
+    executor = BitgetExecutor.__new__(BitgetExecutor)
+    executor.bitget = MagicMock()
+    executor.bitget.settings.bitget_default_leverage = 10
+    executor.send_execution_notification = AsyncMock()
+    executor.decide_order_type = MagicMock(return_value=('market', 'test'))
+    executor.calculate_effective_margin = MagicMock(return_value=32.0)
+    executor.bitget.get_account_state.return_value = {'available_balance': 1000.0}
+    executor.bitget.get_contract_size.return_value = 0.1
+    executor.bitget.place_market_order.return_value = {
+        'success': True,
+        'order_id': 'oid-1',
+        'order_status': 'filled',
+    }
+
+    result = asyncio.run(
+        executor.execute_open(
+            {
+                'symbol': 'ETHUSDT',
+                'action': 'buy',
+                'margin': 32.0,
+                'entry_price': 2000.0,
+                'stop_loss': 1980.0,
+                'take_profit': 2040.0,
+            },
+            2000.0,
+        )
+    )
+
+    assert result['success'] is True
+    executor.bitget.update_leverage.assert_called_once_with('ETH', 10)
+    executor.bitget.place_market_order.assert_called_once_with('ETH', is_buy=True, size=1)