diff --git a/xls2ddl/tmpls.py b/xls2ddl/tmpls.py
index 87d73e4..3869bf1 100644
--- a/xls2ddl/tmpls.py
+++ b/xls2ddl/tmpls.py
@@ -149,7 +149,7 @@ if not ns.get('sort'):
 {% if type(sortby) == type("") %}
 	ns['sort'] = '{{sortby}}'
 {% else %}
-	ns['sort'] = json.loads({{json.dumps(sortby)}})
+	ns['sort'] = json.loads('{{json.dumps(sortby)}}')
 {% endif %}
 {% else %}
 	ns['sort'] = 'id'
@@ -160,7 +160,7 @@ ns['sort'] = '{{relation.outter_field}}_text'
 sql = '''{{sql}}'''
 {% if not relation %}
 {% if data_filter %}
-filterjson = json.loads({{json.dumps(data_filter, ensure_ascii=False)}})
+filterjson = json.loads('{{json.dumps(data_filter, ensure_ascii=False)}}')
 {% else %}
 filterjson = None
 fields_str=r'''{{json.dumps(fields, indent=4, ensure_ascii=False)}}'''
@@ -450,7 +450,7 @@ async with db.sqlorContext(dbname) as sor:
 			}
 		}
 {% endif %}
-	tblfields = json.loads({{json.dumps(fields, ensure_ascii=False)}})
+	tblfields = json.loads('{{json.dumps(fields, ensure_ascii=False)}}')
 	tblfname = [ f['name'] for f in tblfields ]
 	other_keys = [ k for k in ns.keys() if k in tblfname and k != 'id' ]
 	if len(other_keys) > 0: