diff --git a/lib/http/video.dart b/lib/http/video.dart
index 95ea6782..406e59f6 100644
--- a/lib/http/video.dart
+++ b/lib/http/video.dart
@@ -536,7 +536,8 @@ class VideoHttp {
   // 获取字幕内容
   static Future<Map<String, dynamic>> getSubtitleContent(url) async {
     var res = await Request().get('https:$url');
-    final String content = SubTitleUtils.convertToWebVTT(res.data['body']);
+    final String content =
+        await SubTitleUtils.convertToWebVTT(res.data['body']);
     final List body = res.data['body'];
     return {'content': content, 'body': body};
   }
diff --git a/lib/utils/subtitle.dart b/lib/utils/subtitle.dart
index 1b4088f3..9743711c 100644
--- a/lib/utils/subtitle.dart
+++ b/lib/utils/subtitle.dart
@@ -1,21 +1,51 @@
+import 'dart:async';
+import 'dart:isolate';
+
 class SubTitleUtils {
   // 格式整理
-  static String convertToWebVTT(List jsonData) {
-    String webVTTContent = 'WEBVTT FILE\n\n';
+  static Future<String> convertToWebVTT(List jsonData) async {
+    final receivePort = ReceivePort();
+    await Isolate.spawn(_convertToWebVTTIsolate, receivePort.sendPort);
 
-    for (int i = 0; i < jsonData.length; i++) {
-      final item = jsonData[i];
-      double from = double.parse(item['from'].toString());
-      double to = double.parse(item['to'].toString());
-      int sid = (item['sid'] ?? 0) as int;
-      String content = item['content'] as String;
+    final sendPort = await receivePort.first as SendPort;
+    final response = ReceivePort();
+    sendPort.send([jsonData, response.sendPort]);
 
-      webVTTContent += '$sid\n';
-      webVTTContent += '${formatTime(from)} --> ${formatTime(to)}\n';
-      webVTTContent += '$content\n\n';
+    return await response.first as String;
+  }
+
+  static void _convertToWebVTTIsolate(SendPort sendPort) async {
+    final port = ReceivePort();
+    sendPort.send(port.sendPort);
+
+    await for (final message in port) {
+      final List jsonData = message[0];
+      final SendPort replyTo = message[1];
+
+      String webVTTContent = 'WEBVTT FILE\n\n';
+      int chunkSize = 100; // 每次处理100条数据
+      int totalChunks = (jsonData.length / chunkSize).ceil();
+
+      for (int chunk = 0; chunk < totalChunks; chunk++) {
+        int start = chunk * chunkSize;
+        int end = start + chunkSize;
+        if (end > jsonData.length) end = jsonData.length;
+
+        for (int i = start; i < end; i++) {
+          final item = jsonData[i];
+          double from = double.parse(item['from'].toString());
+          double to = double.parse(item['to'].toString());
+          int sid = (item['sid'] ?? 0) as int;
+          String content = item['content'] as String;
+
+          webVTTContent += '$sid\n';
+          webVTTContent += '${formatTime(from)} --> ${formatTime(to)}\n';
+          webVTTContent += '$content\n\n';
+        }
+      }
+
+      replyTo.send(webVTTContent);
     }
-
-    return webVTTContent;
   }
 
   static String formatTime(num seconds) {