diff --git a/hb_server/apps/wf/services.py b/hb_server/apps/wf/services.py
index e9a0cb4..7ff0fbe 100644
--- a/hb_server/apps/wf/services.py
+++ b/hb_server/apps/wf/services.py
@@ -112,6 +112,9 @@ class WfService(object):
         destination_state = transition.destination_state
         ticket_all_value = cls.get_ticket_all_field_value(ticket)
         ticket_all_value.update(**ticket_data)
+        for key, value in ticket_all_value.items():
+                if isinstance(ticket_all_value[key], str):
+                    ticket_all_value[key] = "'''" + ticket_all_value[key] + "'''"
         if transition.condition_expression:
             for i in transition.condition_expression:
                 expression = i['expression'].format(**ticket_all_value)