diff --git a/MainForm.cs b/MainForm.cs
index 48d4920..f3fb0bf 100644
--- a/MainForm.cs
+++ b/MainForm.cs
@@ -129,6 +129,13 @@ public MainForm()
                 SelectedIndex = 0,
                 ToolTip = Resources.PROTOCOL_FOR_TRACEROUTING
             };
+            protocolSelection.SelectedKey = UserSettings.selectedProtocol;
+            protocolSelection.SelectedKeyChanged += (sender, e) =>
+            {
+                UserSettings.selectedProtocol = protocolSelection.SelectedKey;
+                UserSettings.SaveSettings();
+            };
+
             dataProviderSelection = new DropDown
             {
                 Items = {
@@ -147,11 +154,24 @@ public MainForm()
             if (UserSettings.enable_ip2region == true) dataProviderSelection.Items.Add(new ListItem { Text = "Ip2region", Key = "--data-provider Ip2region" });
             if (UserSettings.enable_ipinfolocal == true) dataProviderSelection.Items.Add(new ListItem { Text = "IPInfoLocal", Key = "--data-provider IPInfoLocal" });
 
+            dataProviderSelection.SelectedKey = UserSettings.selectedDataProvider;
+            dataProviderSelection.SelectedKeyChanged += (sender, e) =>
+            {
+                UserSettings.selectedDataProvider = dataProviderSelection.SelectedKey;
+                UserSettings.SaveSettings();
+            };
+
             if (UserSettings.localDBPath != "") IPDBLoader.Load();
 
             dnsResolverSelection = new DropDown();
             dnsResolverSelection.SelectedKeyChanged += resolveParamChanged;
             LoadDNSResolvers();
+            dnsResolverSelection.SelectedKey = UserSettings.selectedDnsResolver;
+            dnsResolverSelection.SelectedKeyChanged += (sender, e) =>
+            {
+                UserSettings.selectedDnsResolver = dnsResolverSelection.SelectedKey;
+                UserSettings.SaveSettings();
+            };
 
             tracerouteGridView = new GridView { DataStore = tracerouteResultCollection };
             tracerouteGridView.MouseUp += Dragging_MouseUp;
diff --git a/PreferencesDialog.xeto b/PreferencesDialog.xeto
index 013836b..590dbf6 100644
--- a/PreferencesDialog.xeto
+++ b/PreferencesDialog.xeto
@@ -149,7 +149,6 @@
 											<Label Text="{x:Static resource:Resources.POW_PROVIDER}"></Label>
 											<DropDown x:Name="POWProvider" SelectedIndex="0">
 												<ListItem Text="{x:Static resource:Resources.POW_PROVIDER_LEOMOE}" Key="api.leo.moe"></ListItem>
-												<ListItem Text="{x:Static resource:Resources.POW_PROVIDER_SAKURA}" Key="sakura"></ListItem>
 											</DropDown>
 										</TableRow>
 										<TableRow>
diff --git a/UserSettings.cs b/UserSettings.cs
index ce5024a..475c57b 100644
--- a/UserSettings.cs
+++ b/UserSettings.cs
@@ -126,5 +126,14 @@ internal class UserSettings : Advexp.Settings<UserSettings>
 
         [Setting(Name = "maskedHopsMode", Default = "ip_half")]
         public static string maskedHopsMode { get; set; }
+
+        [Setting(Name = "selectedDnsResolver", Default = "system")]
+        public static string selectedDnsResolver { get; set; }
+
+        [Setting(Name = "selectedProtocol", Default = "")]
+        public static string selectedProtocol { get; set; }
+
+        [Setting(Name = "selectedDataProvider", Default = "")]
+        public static string selectedDataProvider { get; set; }
     }
 }