diff --git a/logger/decision_logger.go b/logger/decision_logger.go
index efa5ab74..746f58ad 100644
--- a/logger/decision_logger.go
+++ b/logger/decision_logger.go
@@ -409,18 +409,24 @@ func (l *DecisionLogger) AnalyzePerformance(lookbackCycles int) (*PerformanceAna
 					quantity := openPos["quantity"].(float64)
 					leverage := openPos["leverage"].(int)
 
+					// 对于 partial_close，使用实际平仓数量；否则使用完整仓位数量
+					actualQuantity := quantity
+					if action.Action == "partial_close" {
+						actualQuantity = action.Quantity
+					}
+
 					// 计算实际盈亏（USDT）
-					// 合约交易 PnL 计算：quantity × 价格差
+					// 合约交易 PnL 计算：actualQuantity × 价格差
 					// 注意：杠杆不影响绝对盈亏，只影响保证金需求
 					var pnl float64
 					if side == "long" {
-						pnl = quantity * (action.Price - openPrice)
+						pnl = actualQuantity * (action.Price - openPrice)
 					} else {
-						pnl = quantity * (openPrice - action.Price)
+						pnl = actualQuantity * (openPrice - action.Price)
 					}
 
 					// 计算盈亏百分比（相对保证金）
-					positionValue := quantity * openPrice
+					positionValue := actualQuantity * openPrice
 					marginUsed := positionValue / float64(leverage)
 					pnlPct := 0.0
 					if marginUsed > 0 {
@@ -431,7 +437,7 @@ func (l *DecisionLogger) AnalyzePerformance(lookbackCycles int) (*PerformanceAna
 					outcome := TradeOutcome{
 						Symbol:        symbol,
 						Side:          side,
-						Quantity:      quantity,
+						Quantity:      actualQuantity,
 						Leverage:      leverage,
 						OpenPrice:     openPrice,
 						ClosePrice:    action.Price,