diff --git a/src/main/java/com/zhongan/devpilot/completions/inline/CompletionPreview.java b/src/main/java/com/zhongan/devpilot/completions/inline/CompletionPreview.java
index a4144d6..0a70cf1 100644
--- a/src/main/java/com/zhongan/devpilot/completions/inline/CompletionPreview.java
+++ b/src/main/java/com/zhongan/devpilot/completions/inline/CompletionPreview.java
@@ -138,7 +138,6 @@ private DevPilotCompletion createPreview() {
 
     public void dispose() {
         editor.putUserData(INLINE_COMPLETION_PREVIEW, null);
-        completions.forEach(DevPilotCompletion::clear);
     }
 
     public void applyPreview(@Nullable Caret caret) {
@@ -196,7 +195,7 @@ private void applyPreviewInternal(@NotNull Integer cursorOffset, Project project
             getAutoImportHandler(editor, fileAfterCompletion, startOffset, endOffset).invoke();
         });
 
-        TelemetryUtils.completionAccept(completion.id, file);
+        TelemetryUtils.completionAccept(completion.id, file, completion.getUnacceptedLines());
     }
 
     public void applyPreviewByLine(@Nullable Caret caret) {
@@ -248,7 +247,7 @@ private void applyPreviewInternalByLine(Project project, PsiFile file) {
         ApplicationManager.getApplication().executeOnPooledThread(() -> {
             getAutoImportHandler(editor, fileAfterCompletion, startOffset, endOffset).invoke();
         });
-        TelemetryUtils.completionAccept(completion.id, file);
+        TelemetryUtils.completionAccept(completion.id, file, line);
     }
 
     public void continuePreview() {
diff --git a/src/main/java/com/zhongan/devpilot/completions/prediction/DevPilotCompletion.java b/src/main/java/com/zhongan/devpilot/completions/prediction/DevPilotCompletion.java
index 9b9f386..b866431 100644
--- a/src/main/java/com/zhongan/devpilot/completions/prediction/DevPilotCompletion.java
+++ b/src/main/java/com/zhongan/devpilot/completions/prediction/DevPilotCompletion.java
@@ -132,7 +132,7 @@ public String getUnacceptedLines() {
                     result.add(lineState.line);
                 }
             }
-            return "\n" + String.join("\n", result);
+            return "\n" + String.join("\n", result);  // must add "\n", otherwise block preview will occur change line issue.
         }
 
         public void init(List<LineState> lineStates) {
@@ -218,6 +218,10 @@ public LineStateItems.LineState getNextUnacceptLineState() {
         return lineStateItems.getLineStates().get(lineStateItems.index);
     }
 
+    public String getUnacceptedLines() {
+        return this.lineStateItems.getUnacceptedLines().substring(1);   // skip first \n to avoid extra lines count in accept telemetry
+    }
+
     public void acceptLine(int offset) {
         lineStateItems.acceptLine(this.lineStateItems.index++, offset);
     }
diff --git a/src/main/java/com/zhongan/devpilot/util/TelemetryUtils.java b/src/main/java/com/zhongan/devpilot/util/TelemetryUtils.java
index 511c2a1..c5a7878 100644
--- a/src/main/java/com/zhongan/devpilot/util/TelemetryUtils.java
+++ b/src/main/java/com/zhongan/devpilot/util/TelemetryUtils.java
@@ -71,7 +71,7 @@ public static void chatAccept(String id, String acceptLines, String language, Ch
         sendMessage(url, requestJson);
     }
 
-    public static void completionAccept(String id, PsiFile file) {
+    public static void completionAccept(String id, PsiFile file, String acceptLines) {
         if (!isTelemetryTurnOn()) {
             return;
         }
@@ -87,10 +87,10 @@ public static void completionAccept(String id, PsiFile file) {
             language = lang.getLanguageName();
         }
 
-        completionAccept(id, language);
+        completionAccept(id, language, acceptLines);
     }
 
-    public static void completionAccept(String id, String language) {
+    public static void completionAccept(String id, String language, String acceptLines) {
         if (!isTelemetryTurnOn()) {
             return;
         }
@@ -100,7 +100,7 @@ public static void completionAccept(String id, String language) {
             language = "text";
         }
 
-        var completionAcceptRequest = new CompletionAcceptRequest(language.toLowerCase(Locale.ROOT));
+        var completionAcceptRequest = new CompletionAcceptRequest(language.toLowerCase(Locale.ROOT), acceptLines);
         var requestJson = JsonUtils.toJson(completionAcceptRequest);
 
         if (requestJson == null) {
@@ -201,8 +201,11 @@ public void setActionType(String actionType) {
     static class CompletionAcceptRequest {
         private String language;
 
-        CompletionAcceptRequest(String language) {
+        private String acceptLines;
+
+        CompletionAcceptRequest(String language, String acceptLines) {
             this.language = language;
+            this.acceptLines = acceptLines;
         }
 
         public String getLanguage() {
@@ -212,5 +215,14 @@ public String getLanguage() {
         public void setLanguage(String language) {
             this.language = language;
         }
+
+        public String getAcceptLines() {
+            return acceptLines;
+        }
+
+        public void setAcceptLines(String acceptLines) {
+            this.acceptLines = acceptLines;
+        }
+
     }
 }