diff --git a/orders/services/merchant_order_list_filters.py b/orders/services/merchant_order_list_filters.py
index 33300df..fb93298 100644
--- a/orders/services/merchant_order_list_filters.py
+++ b/orders/services/merchant_order_list_filters.py
@@ -1,6 +1,7 @@
 """商家订单列表通用筛选（商家老板接口 + 子客服列表共用）。"""
 from datetime import datetime
 
+from django.conf import settings
 from django.db.models import Q
 from django.utils import timezone
 from django.utils.dateparse import parse_datetime
@@ -8,11 +9,16 @@ from django.utils.dateparse import parse_datetime
 from backend.utils import pick_leixing_id
 
 
-def _aware_dt(dt):
+def _db_dt(dt):
+    """与项目 USE_TZ 设置一致：USE_TZ=False 时必须返回 naive datetime。"""
     if dt is None:
         return None
-    if timezone.is_naive(dt):
-        return timezone.make_aware(dt, timezone.get_current_timezone())
+    if settings.USE_TZ:
+        if timezone.is_naive(dt):
+            return timezone.make_aware(dt, timezone.get_current_timezone())
+        return dt
+    if timezone.is_aware(dt):
+        return timezone.make_naive(dt, timezone.get_current_timezone())
     return dt
 
 
@@ -30,15 +36,15 @@ def parse_order_list_bound(value, is_end=False):
             return None
         if is_end:
             base = base.replace(hour=23, minute=59, second=59)
-        return _aware_dt(base)
+        return _db_dt(base)
     dt = parse_datetime(raw.replace(' ', 'T', 1) if ' ' in raw and 'T' not in raw else raw)
     if dt is None:
         try:
             base = datetime.strptime(raw[:19], '%Y-%m-%d %H:%M:%S')
-            return _aware_dt(base)
+            return _db_dt(base)
         except ValueError:
             return None
-    return _aware_dt(dt)
+    return _db_dt(dt)
 
 
 def apply_merchant_order_list_filters(qs, data):