diff --git a/apps/pum/serializers.py b/apps/pum/serializers.py
index 27128771..014b6364 100644
--- a/apps/pum/serializers.py
+++ b/apps/pum/serializers.py
@@ -18,7 +18,7 @@ class PuPlanSerializer(CustomModelSerializer):
     class Meta:
         model = PuPlan
         fields = '__all__'
-        read_only_fields = EXCLUDE_FIELDS_DEPT + ['state']
+        read_only_fields = EXCLUDE_FIELDS_DEPT + ['state', 'submit_time']
 
     def update(self, instance, validated_data):
         if instance.state != PuPlan.PUPLAN_CREATE:
@@ -64,7 +64,7 @@ class PuOrderSerializer(CustomModelSerializer):
     class Meta:
         model = PuOrder
         fields = '__all__'
-        read_only_fields = EXCLUDE_FIELDS_DEPT + ['state']
+        read_only_fields = EXCLUDE_FIELDS_DEPT + ['state', 'submit_time']
 
     def update(self, instance, validated_data):
         validated_data.pop('supplier')