diff --git a/backend/SystemUpdater/Core/utils.py b/backend/SystemUpdater/Core/utils.py
index 8560df9..ad338ed 100644
--- a/backend/SystemUpdater/Core/utils.py
+++ b/backend/SystemUpdater/Core/utils.py
@@ -759,8 +759,30 @@ def deb_verify(deb_path, _isinstall = False):
         return 3
 
 def PolicyKit_Authority(details = '', sender = None):
+    _allow_kylinsign = False
+    _verify_kylinsign = False
     try:
+        #获取未知来源应用安装策略Unknown sources apply installation policies
+        inst_policies_path = "/etc/dpkg/dpkg.cfg"
+        if os.path.isfile(inst_policies_path):
+            with open(inst_policies_path, "r") as f:
+                lines = f.readlines()
+            for line in lines:
+                if "allow-kylinsign" in line:
+                    _allow_kylinsign = True
+                if "verify-kylinsign" in line:
+                    _verify_kylinsign = True
+            if _allow_kylinsign == True and _verify_kylinsign == False: #策略： 阻止
+                logging.debug("unknown sources apply installation policies: deter")
+                return False,_("The package is unsigned, refuses to install.")
+            elif _allow_kylinsign == True and _verify_kylinsign == True: #策略： 警告
+                logging.debug("unknown sources apply installation policies: warning")
+            elif _allow_kylinsign == False and _verify_kylinsign == False: #策略： 关闭
+                logging.debug("unknown sources apply installation policies: close")
+        else:
+            logging.warning("Unknown sources apply installation policies get failed.")
 
+        #用户鉴权
         details = {'polkit.message':details}
         cancel_id = ''
         action = "cn.kylinos.KylinSystemUpdater.action"