diff --git a/AssetManager.Models/DTOs/PortfolioDTO.cs b/AssetManager.Models/DTOs/PortfolioDTO.cs
index bcb7639..c4f5271 100644
--- a/AssetManager.Models/DTOs/PortfolioDTO.cs
+++ b/AssetManager.Models/DTOs/PortfolioDTO.cs
@@ -114,6 +114,7 @@ public class CreateTransactionRequest
     public string? remark { get; set; }
     public string assetType { get; set; } = "Stock"; // Stock / Crypto
     public string? transactionTime { get; set; } // 实际交易时间，可选
+    public string? transactionDate { get; set; } // 交易日期，前端传入 YYYY-MM-DD 格式
 }
 
 public class CreateTransactionResponse
diff --git a/AssetManager.Services/PortfolioService.cs b/AssetManager.Services/PortfolioService.cs
index 5d61388..f293bbc 100644
--- a/AssetManager.Services/PortfolioService.cs
+++ b/AssetManager.Services/PortfolioService.cs
@@ -361,7 +361,15 @@ public class PortfolioService : IPortfolioService
 
         // 解析实际交易时间，如果解析失败则用当前时间
         DateTime transactionTime = DateTime.Now;
-        if (!string.IsNullOrEmpty(request.transactionTime))
+        if (!string.IsNullOrEmpty(request.transactionDate))
+        {
+            if (DateTime.TryParse(request.transactionDate, out var parsedDate))
+            {
+                // 如果只传了日期，时间部分默认用当前时间
+                transactionTime = parsedDate.Date + DateTime.Now.TimeOfDay;
+            }
+        }
+        else if (!string.IsNullOrEmpty(request.transactionTime))
         {
             if (DateTime.TryParse(request.transactionTime, out var parsedTime))
             {