diff --git a/apps/wpm/filters.py b/apps/wpm/filters.py
index 11280cc5..cb28bdb3 100644
--- a/apps/wpm/filters.py
+++ b/apps/wpm/filters.py
@@ -197,8 +197,8 @@ class BatchStFilter(filters.FilterSet):
         fields = {
             "batch": ["exact", "contains", "startswith"],
             "version": ["exact", "gte", "lte"],
-            "first_time": ["exact", "gte", "lte"],
-            "last_time": ["exact", "gte", "lte"],
+            "first_time": ["exact", "gte", "lte", "isnull"],
+            "last_time": ["exact", "gte", "lte", "isnull"],
             "update_time": ["exact", "gte", "lte"],
             "material_start": ["exact"],
             "material_start__cate": ["exact"],