diff --git a/nixos/modules/networking/dns.nix b/nixos/modules/networking/dns.nix
index bdcff6c..7f44587 100644
--- a/nixos/modules/networking/dns.nix
+++ b/nixos/modules/networking/dns.nix
@@ -9,7 +9,12 @@ in {
     myFlake.nixos.networking.dns = {
       provider = lib.mkOption {
         type = lib.types.enum ["google" "alidns"];
-        default = "google";
+        default =
+          {
+            "Asia/Shanghai" = "alidns";
+          }
+          .${config.time.timeZone}
+          or "google";
         example = "alidns";
         description = "Select desired DNS provider.";
       };
diff --git a/users/guanranwang/nixos/profiles/core/default.nix b/users/guanranwang/nixos/profiles/core/default.nix
index 67efe20..f7412b2 100644
--- a/users/guanranwang/nixos/profiles/core/default.nix
+++ b/users/guanranwang/nixos/profiles/core/default.nix
@@ -1,7 +1,6 @@
 {
   pkgs,
   config,
-  lib,
   ...
 }: {
   users.users."guanranwang" = {
@@ -21,7 +20,6 @@
   };
 
   programs.fish.enable = true;
-  myFlake.nixos.networking.dns.provider = lib.mkDefault "alidns";
   users.groups."nix-access-tokens" = {};
   nix.extraOptions = "!include ${config.sops.secrets.nix-access-tokens.path}";