diff --git a/xls2ddl/tmpls.py b/xls2ddl/tmpls.py
index d20a01c..8e68bb3 100644
--- a/xls2ddl/tmpls.py
+++ b/xls2ddl/tmpls.py
@@ -133,8 +133,10 @@ ns['sort'] = '{{relation.outter_field}}_text'
 sql = '''{{sql}}'''
 {% if not relation %}
 filterjson = params_kw.get('data_filter')
+fields_str="""{{json.dumps(fields, indent=4, ensure_ascii=False)}}"""
+ori_fields = json.loads(fields_str)
 if not filterjson:
-	fields = [ f['name'] for f in {{json.dumps(fields, indent=4, ensure_ascii=False)}} ]
+	fields = [ f['name'] for f in ori_fields}} ]
 	filterjson = default_filterjson(fields, ns)
 filterdic = ns.copy()
 filterdic['filterstr'] = ''