diff --git a/backend/app/routers/information.py b/backend/app/routers/information.py
index eb1f6c3..e2be6b1 100644
--- a/backend/app/routers/information.py
+++ b/backend/app/routers/information.py
@@ -127,10 +127,11 @@ def get_information_list(
     if user_id:
         query = query.filter(Information.user_id == user_id)
     
-    # 成交日期过滤 - 使用cast确保字符串与date字段正确比较
+    # 成交日期过滤
     if deal_date:
-        from sqlalchemy import cast, String
-        query = query.filter(cast(Information.deal_date, String) == deal_date)
+        from datetime import date
+        deal_date_obj = date.fromisoformat(deal_date)
+        query = query.filter(Information.deal_date == deal_date_obj)
     
     # 按创建时间倒序
     query = query.order_by(Information.created_at.desc())