diff --git a/backend/app/crypto_agent/crypto_agent.py b/backend/app/crypto_agent/crypto_agent.py
index 3edf12f..e45bda9 100644
--- a/backend/app/crypto_agent/crypto_agent.py
+++ b/backend/app/crypto_agent/crypto_agent.py
@@ -2249,8 +2249,17 @@ class CryptoAgent:
                 for p in self.bitget.get_open_positions()
             )
 
+            # 获取决策层的保证金建议（如果有）
+            quantity = decision.get('quantity', 0)  # 保证金金额
             leverage = min(decision.get('leverage', 5), 10)
 
+            # 如果决策层提供了保证金，计算最小仓位价值
+            min_position_from_margin = 0
+            if quantity and isinstance(quantity, (int, float)) and quantity > 0:
+                min_position_from_margin = quantity * leverage  # 保证金 × 杠杆
+                logger.info(f"   决策层保证金: ${quantity:.2f} → 最小仓位价值: ${min_position_from_margin:.2f}")
+
+            # 计算最大仓位限制
             max_by_config = self.bitget.max_single_position
             max_by_available = available_balance * leverage
             max_by_total_leverage = (
@@ -2259,6 +2268,21 @@ class CryptoAgent:
             max_position_usd = min(max_by_config, max_by_available, max_by_total_leverage)
             max_position_usd = min(max_position_usd, current_balance * 0.5)
 
+            # 确保最小仓位价值（如果决策层提供了保证金）
+            if min_position_from_margin > 0:
+                max_position_usd = max(max_position_usd, min_position_from_margin)
+                logger.info(f"   调整最小仓位: ${max_position_usd:.2f} (确保 ≥ 保证金 × 杠杆)")
+
+            # 详细日志
+            logger.info(f"💰 Bitget 仓位计算:")
+            logger.info(f"   账户余额: ${current_balance:.2f}, 可用: ${available_balance:.2f}")
+            logger.info(f"   当前持仓价值: ${total_position_value:.2f}")
+            logger.info(f"   杠杆: {leverage}x")
+            logger.info(f"   单笔上限: ${max_by_config:.2f}")
+            logger.info(f"   可用杠杆空间: ${max_by_available:.2f}")
+            logger.info(f"   总杠杆空间: ${max_by_total_leverage:.2f}")
+            logger.info(f"   最终仓位 USD: ${max_position_usd:.2f}")
+
             if max_position_usd <= 0:
                 logger.warning(f"⚠️  Bitget 可用保证金不足，无法开仓 (balance={current_balance:.2f})")
                 return 0
@@ -2266,16 +2290,28 @@ class CryptoAgent:
             symbol = decision.get('symbol', '').replace('USDT', '')
             contract_size = self.bitget.get_contract_size(symbol)
             if contract_size <= 0 or current_price <= 0:
+                logger.warning(f"⚠️  Bitget 合约规格或价格无效 (contract_size={contract_size}, price={current_price})")
                 return 0
 
             # notional → coins → contracts（向下取整）
             coin_amount = max_position_usd / current_price
             contracts = math.floor(coin_amount / contract_size)
 
+            logger.info(f"   币数量: {coin_amount:.6f}, 合约规格: {contract_size}, 张数: {contracts}")
+
+            # 如果计算出的张数 < 1，检查是否是保证金太少
             if contracts < 1:
-                logger.warning(
-                    f"⚠️  Bitget 仓位计算 {coin_amount:.4f} 币 = {contracts} 张，低于最小 1 张"
-                )
+                min_coins_needed = contract_size
+                min_usd_needed = min_coins_needed * current_price
+                min_margin_needed = min_usd_needed / leverage
+
+                logger.warning(f"⚠️  Bitget 仓位计算 {coin_amount:.4f} 币 = {contracts} 张，低于最小 1 张")
+                logger.warning(f"   最小需要: {min_coins_needed} 币 ≈ ${min_usd_needed:.2f}")
+                logger.warning(f"   最小保证金: ${min_margin_needed:.2f} (杠杆 {leverage}x)")
+
+                if quantity and isinstance(quantity, (int, float)) and quantity > 0:
+                    logger.warning(f"   当前保证金: ${quantity:.2f}，建议提高到至少 ${min_margin_needed:.2f}")
+
                 return 0
 
             logger.info(