diff --git a/addons/ospp_slide/models/models.py b/addons/ospp_slide/models/models.py
index 8cc85c8..adc4402 100644
--- a/addons/ospp_slide/models/models.py
+++ b/addons/ospp_slide/models/models.py
@@ -175,7 +175,7 @@ class ChannelInstance(models.Model):
             <div>预祝学习愉快!</div>
             """
             partner_ids = partner_obj.search([('channel_id', '=', rec.channel_id.id)])
-            rec.message_unsubscribe(partner_ids=[x.partner_id.id for x in partner_ids])
+            rec.channel_id.message_unsubscribe(partner_ids=[x.partner_id.id for x in partner_ids])
 
             partner_ids = [x.partner_id.id for x in rec.user_scope]
             kwargs = {}