diff --git a/AssetManager.Services/PortfolioService.cs b/AssetManager.Services/PortfolioService.cs
index ddb7dec..11e1227 100755
--- a/AssetManager.Services/PortfolioService.cs
+++ b/AssetManager.Services/PortfolioService.cs
@@ -128,7 +128,7 @@ public class PortfolioService : IPortfolioService
                 Shares = (decimal)stock.Amount,
                 AvgPrice = (decimal)stock.Price,
                 TotalCost = (decimal)(stock.Price * stock.Amount), // 初始成本 = 价格 × 数量
-                Currency = request.Currency,
+                Currency = stock.Currency ?? request.Currency, // 使用持仓币种，而非组合本位币
                 CreatedAt = buyTime,
                 UpdatedAt = DateTime.Now
             };