diff --git a/src/TMSpeech.Core/ConfigTypes.cs b/src/TMSpeech.Core/ConfigTypes.cs
index 4941b0d..556144b 100644
--- a/src/TMSpeech.Core/ConfigTypes.cs
+++ b/src/TMSpeech.Core/ConfigTypes.cs
@@ -64,6 +64,7 @@ public static class NotificationConfigTypes
 
     public const string NotificationType = "notification.NotificationType";
     public const string SensitiveWords = "notification.SensitiveWords";
+    public const string HasShownLockUsage = "notification.ShownLockUsage";
 
     public static class NotificationTypeEnum
     {
diff --git a/src/TMSpeech.Core/JobManager.cs b/src/TMSpeech.Core/JobManager.cs
index 4e71246..d45b7cb 100644
--- a/src/TMSpeech.Core/JobManager.cs
+++ b/src/TMSpeech.Core/JobManager.cs
@@ -225,6 +225,9 @@ private void StopRecognize()
 
             _audioSource = null;
             _recognizer = null;
+
+            OnSentenceDone(new SpeechEventArgs());
+            OnTextChanged(new SpeechEventArgs());
         }
 
         public override void Start()
diff --git a/src/TMSpeech.Core/Services/Notification/NotificationManager.cs b/src/TMSpeech.Core/Services/Notification/NotificationManager.cs
index d365be1..bcb70d5 100644
--- a/src/TMSpeech.Core/Services/Notification/NotificationManager.cs
+++ b/src/TMSpeech.Core/Services/Notification/NotificationManager.cs
@@ -18,7 +18,7 @@ public void UnregistNotificationService(INotificationService service)
     public void Notify(string content, string? title, NotificationType type = NotificationType.Info)
     {
         if (ConfigManagerFactory.Instance.Get<int>(NotificationConfigTypes.NotificationType) == NotificationConfigTypes.NotificationTypeEnum.None) return;
-        if (type > _level)
+        if (type >= _level)
         {
             foreach (var service in _services)
             {
diff --git a/src/TMSpeech.GUI/ViewModels/MainViewModel.cs b/src/TMSpeech.GUI/ViewModels/MainViewModel.cs
index 21e0f80..6714272 100644
--- a/src/TMSpeech.GUI/ViewModels/MainViewModel.cs
+++ b/src/TMSpeech.GUI/ViewModels/MainViewModel.cs
@@ -11,6 +11,7 @@
 using ReactiveUI.Fody.Helpers;
 using TMSpeech.Core;
 using TMSpeech.Core.Plugins;
+using TMSpeech.Core.Services.Notification;
 
 namespace TMSpeech.GUI.ViewModels;
 
@@ -164,7 +165,16 @@ public MainViewModel()
             .Select(x => x == JobStatus.Running || x == JobStatus.Paused)
             .ToPropertyEx(this, x => x.StopButtonVisible);
 
-        this.LockCommand = ReactiveCommand.Create(() => { IsLocked = true; });
+        this.LockCommand = ReactiveCommand.Create(() => { 
+            IsLocked = true;
+            // Inform user if user uses it for the first time.
+            var lockedShown = ConfigManagerFactory.Instance.Get<bool>(NotificationConfigTypes.HasShownLockUsage);
+            if (!lockedShown)
+            {
+                ConfigManagerFactory.Instance.Apply(NotificationConfigTypes.HasShownLockUsage, true);
+                NotificationManager.Instance.Notify("锁定成功", "右键托盘图标以解锁", NotificationType.Info);
+            }
+        });
 
         this.PlayCommand = ReactiveCommand.CreateFromTask(
             async () => { await Task.Run(() => { _jobManager.Start(); }); },