diff --git a/apps/common/auth/struct/permission.py b/apps/common/auth/struct/permission.py
index e1a5d7bae91..1aeebdb6bf5 100644
--- a/apps/common/auth/struct/permission.py
+++ b/apps/common/auth/struct/permission.py
@@ -39,8 +39,6 @@ def get_resource_permission_key(self, resource_id):
         resource = f":r:{self.resource_id}" if self.resource_id else ""
         flag = f"_{self.flag}" if self.flag else ""
         group = str(self.group)
-        if self.group in (Group.SYSTEM_RES_KNOWLEDGE, Group.KNOWLEDGE) and self.sub_group != self.group:
-            group = f"{group}_{self.sub_group}"
         return f"{group}{flag}{workspace}{resource}"
 
     def __str__(self):