diff --git a/apps/wf/services.py b/apps/wf/services.py
index f3b3754a..0864efdc 100755
--- a/apps/wf/services.py
+++ b/apps/wf/services.py
@@ -6,7 +6,7 @@ from apps.system.models import Dept, User
 from apps.wf.models import CustomField, State, Ticket, TicketFlow, Transition, Workflow
 from rest_framework.exceptions import APIException, PermissionDenied, ValidationError
 from django.utils import timezone
-from datetime import timedelta
+from datetime import timedelta, datetime
 import random
 from apps.utils.queryset import get_parent_queryset
 from apps.wf.tasks import run_task
@@ -97,15 +97,15 @@ class WfService(object):
         return Transition.objects.filter(**kwargs).all()
 
     @classmethod
-    def get_ticket_sn(cls, workflow: Workflow):
+    def get_ticket_sn(cls, workflow: Workflow, now: str = ''):
         """
         生成工单流水号
         """
-        now = timezone.now()
+        if now == '':
+            now = datetime.now()
         today = str(now)[:10]+' 00:00:00'
-        next_day = str(now+timedelta(days=1))[:10]+' 00:00:00'
-        ticket_day_count_new = Ticket.objects.filter(
-            create_time__gte=today, create_time__lte=next_day, workflow=workflow).count()+1
+        ticket_day_count_new = Ticket.objects.get_queryset(all=True).filter(
+            create_time__gte=today, create_time__lte=now, workflow=workflow).count()+1
         return '%s_%04d%02d%02d%04d' % (workflow.sn_prefix, now.year, now.month, now.day, ticket_day_count_new)
 
     @classmethod