diff --git a/backend/app/services/bitget_trading_api_sdk.py b/backend/app/services/bitget_trading_api_sdk.py
index db818df..62e0278 100644
--- a/backend/app/services/bitget_trading_api_sdk.py
+++ b/backend/app/services/bitget_trading_api_sdk.py
@@ -475,15 +475,22 @@ class BitgetTradingAPI:
             if stop_loss:
                 sl_side = 'sell' if pos_side == 'long' else 'buy'
                 try:
-                    # 使用普通的 create_order 创建止损市价单
                     if self.use_unified_account:
+                        # UTA 模式：用 stopLossPrice 触发策略订单路由
+                        # CCXT 通过 stopLossPrice 判断是否走 privateUtaPostV3TradePlaceStrategyOrder
                         sl_params = {
-                            'stopPrice': stop_loss,
-                            'triggerBy': 'mark_price',
+                            'stopLossPrice': stop_loss,
                             'hedged': True,
                             'reduceOnly': True,
                             'marginCoin': 'USDT',
                         }
+                        sl_order = self.exchange.create_order(
+                            symbol=ccxt_symbol,
+                            type='market',
+                            side=sl_side,
+                            amount=btc_amount,
+                            params=self._with_account_mode_params(sl_params),
+                        )
                     else:
                         sl_params = {
                             'stopPrice': stop_loss,
@@ -492,14 +499,14 @@ class BitgetTradingAPI:
                             'marginCoin': 'USDT',
                             'reduceOnly': True,
                         }
-                    sl_order = self.exchange.create_order(
-                        symbol=ccxt_symbol,
-                        type='stop_market',
-                        side=sl_side,
-                        amount=btc_amount,
-                        price=None,
-                        params=self._with_account_mode_params(sl_params),
-                    )
+                        sl_order = self.exchange.create_order(
+                            symbol=ccxt_symbol,
+                            type='stop_market',
+                            side=sl_side,
+                            amount=btc_amount,
+                            price=None,
+                            params=sl_params,
+                        )
                     orders_created.append(('止损', sl_order))
                     logger.info(f"✅ 止损单已下: {sl_side} {btc_amount} BTC @ ${stop_loss}")
                 except Exception as e: