diff --git a/app/api/v1/app_valuations/app_valuations.py b/app/api/v1/app_valuations/app_valuations.py
index 231e831..70c40f9 100644
--- a/app/api/v1/app_valuations/app_valuations.py
+++ b/app/api/v1/app_valuations/app_valuations.py
@@ -28,7 +28,10 @@ async def create_valuation(
             user_id=user_id,
             data=data
         )
-        return Success(data=result, msg="估值评估申请提交成功")
+        # 使用model_dump_json()来正确序列化datetime，然后解析为dict
+        import json
+        result_dict = json.loads(result.model_dump_json())
+        return Success(data=result_dict, msg="估值评估申请提交成功")
     except Exception as e:
         raise HTTPException(
             status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
@@ -49,8 +52,11 @@ async def get_my_valuations(
             user_id=user_id,
             query=query
         )
+        # 使用model_dump_json()来正确序列化datetime，然后解析为dict列表
+        import json
+        serialized_items = [json.loads(item.model_dump_json()) for item in result.items]
         return SuccessExtra(
-            data=result.items,
+            data=serialized_items,
             total=result.total,
             page=result.page,
             size=result.size,
@@ -84,7 +90,10 @@ async def get_valuation_detail(
                 detail="估值评估记录不存在"
             )
         
-        return Success(data=result, msg="获取估值评估详情成功")
+        # 使用model_dump_json()来正确序列化datetime，然后解析为dict
+        import json
+        result_dict = json.loads(result.model_dump_json())
+        return Success(data=result_dict, msg="获取估值评估详情成功")
     except HTTPException:
         raise
     except Exception as e:
diff --git a/app/api/v1/valuations/valuations.py b/app/api/v1/valuations/valuations.py
index 9dcfcd5..de41ea6 100644
--- a/app/api/v1/valuations/valuations.py
+++ b/app/api/v1/valuations/valuations.py
@@ -27,6 +27,13 @@ async def create_valuation(data: ValuationAssessmentCreate):
         raise HTTPException(status_code=400, detail=f"创建失败: {str(e)}")
 
 
+@valuations_router.get("/statistics/overview", summary="获取统计信息")
+async def get_statistics():
+    """获取估值评估统计信息"""
+    result = await valuation_controller.get_statistics()
+    return Success(data=result, msg="获取统计信息成功")
+
+
 @valuations_router.get("/{valuation_id}", summary="获取估值评估详情")
 async def get_valuation(valuation_id: int):
     """根据ID获取估值评估详情"""
@@ -105,13 +112,6 @@ async def search_valuations(
     )
 
 
-@valuations_router.get("/statistics/overview", summary="获取统计信息")
-async def get_statistics():
-    """获取估值评估统计信息"""
-    result = await valuation_controller.get_statistics()
-    return Success(data=result, msg="获取统计信息成功")
-
-
 # 批量操作接口
 @valuations_router.post("/batch/delete", summary="批量删除估值评估")
 async def batch_delete_valuations(valuation_ids: list[int]):
diff --git a/app/controllers/valuation.py b/app/controllers/valuation.py
index 594d9ba..65228a3 100644
--- a/app/controllers/valuation.py
+++ b/app/controllers/valuation.py
@@ -1,6 +1,7 @@
 from typing import List, Optional
 from tortoise.expressions import Q
 from tortoise.queryset import QuerySet
+from tortoise.functions import Count
 
 from app.models.valuation import ValuationAssessment
 from app.schemas.valuation import (
@@ -107,13 +108,13 @@ class ValuationController:
         total_count = await self.model.filter(is_active=True).count()
         
         # 按行业统计
-        industry_stats = await self.model.filter(is_active=True).group_by('industry').values('industry', count='COUNT(*)')
+        industry_stats = await self.model.filter(is_active=True).group_by('industry').annotate(count=Count('id')).values('industry', 'count')
         
         # 按非遗等级统计
         heritage_level_stats = await self.model.filter(
             is_active=True, 
             heritage_level__isnull=False
-        ).group_by('heritage_level').values('heritage_level', count='COUNT(*)')
+        ).group_by('heritage_level').annotate(count=Count('id')).values('heritage_level', 'count')
         
         return {
             'total_count': total_count,
diff --git a/app/schemas/valuation.py b/app/schemas/valuation.py
index ec8a00a..df89576 100644
--- a/app/schemas/valuation.py
+++ b/app/schemas/valuation.py
@@ -121,6 +121,9 @@ class UserValuationOut(BaseModel):
 
     class Config:
         from_attributes = True
+        json_encoders = {
+            datetime: lambda v: v.isoformat()
+        }
 
 
 class UserValuationDetail(ValuationAssessmentBase):
@@ -133,6 +136,9 @@ class UserValuationDetail(ValuationAssessmentBase):
 
     class Config:
         from_attributes = True
+        json_encoders = {
+            datetime: lambda v: v.isoformat()
+        }
 
 
 class UserValuationList(BaseModel):