diff --git a/lib/database/song_database.dart b/lib/database/song_database.dart
new file mode 100644
index 0000000..237cd74
--- /dev/null
+++ b/lib/database/song_database.dart
@@ -0,0 +1,120 @@
+// lib/database/song_database.dart
+import 'package:path/path.dart';
+import 'package:sqflite/sqflite.dart';
+import 'package:path_provider/path_provider.dart';
+
+class SongDatabase {
+  static final SongDatabase _instance = SongDatabase._internal();
+  factory SongDatabase() => _instance;
+  SongDatabase._internal();
+
+  static Database? _database;
+
+  Future<Database> get database async {
+    if (_database != null) return _database!;
+    _database = await _initDatabase();
+    return _database!;
+  }
+
+  Future<Database> _initDatabase() async {
+    final dir = await getApplicationDocumentsDirectory();
+    final path = join(dir.path, 'qingting_songs.db');
+    return await openDatabase(
+      path,
+      version: 1,
+      onCreate: _onCreate,
+    );
+  }
+
+  Future<void> _onCreate(Database db, int version) async {
+    await db.execute('''
+      CREATE TABLE songs (
+        song_key TEXT PRIMARY KEY,
+        remote_path TEXT,
+        file_size INTEGER,
+        modified_time INTEGER,
+        etag TEXT,
+        title TEXT,
+        artist TEXT,
+        album TEXT,
+        genre TEXT,
+        artwork_path TEXT,
+        confidence REAL DEFAULT 0.0,
+        validation_count INTEGER DEFAULT 0,
+        first_scan INTEGER,
+        last_scan INTEGER,
+        metadata_status TEXT DEFAULT 'pending'
+      )
+    ''');
+
+    await db.execute('''
+      CREATE TABLE metadata_cache (
+        song_key TEXT PRIMARY KEY,
+        cache_path TEXT,
+        cache_created_at INTEGER,
+        cache_size INTEGER,
+        FOREIGN KEY (song_key) REFERENCES songs(song_key) ON DELETE CASCADE
+      )
+    ''');
+
+    await db.execute('CREATE INDEX idx_songs_artist ON songs(artist)');
+    await db.execute('CREATE INDEX idx_songs_title ON songs(title)');
+  }
+
+  // ---- 查询 ----
+  Future<Map<String, dynamic>?> getSong(String songKey) async {
+    final db = await database;
+    final result =
+        await db.query('songs', where: 'song_key = ?', whereArgs: [songKey]);
+    return result.isNotEmpty ? result.first : null;
+  }
+
+  Future<List<Map<String, dynamic>>> getSongsByArtist(String artist,
+      {int limit = 20}) async {
+    if (artist.isEmpty) return [];
+    final db = await database;
+    return await db.query(
+      'songs',
+      where: 'artist = ?',
+      whereArgs: [artist],
+      limit: limit,
+    );
+  }
+
+  // ---- 写入 ----
+  Future<void> insertSong(Map<String, dynamic> song) async {
+    final db = await database;
+    await db.insert('songs', song,
+        conflictAlgorithm: ConflictAlgorithm.replace);
+  }
+
+  Future<void> updateSong(String songKey, Map<String, dynamic> updates) async {
+    final db = await database;
+    await db.update(
+      'songs',
+      updates,
+      where: 'song_key = ?',
+      whereArgs: [songKey],
+    );
+  }
+
+  // ---- 缓存 ----
+  Future<void> insertCache(Map<String, dynamic> cache) async {
+    final db = await database;
+    await db.insert('metadata_cache', cache,
+        conflictAlgorithm: ConflictAlgorithm.replace);
+  }
+
+  Future<Map<String, dynamic>?> getCache(String songKey) async {
+    final db = await database;
+    final result = await db
+        .query('metadata_cache', where: 'song_key = ?', whereArgs: [songKey]);
+    return result.isNotEmpty ? result.first : null;
+  }
+
+  Future<void> close() async {
+    final db = await database;
+    await db.close();
+    _database = null;
+  }
+}
diff --git a/lib/metadata/metadata_model.dart b/lib/metadata/metadata_model.dart
index 6a192f8..af0716a 100644
--- a/lib/metadata/metadata_model.dart
+++ b/lib/metadata/metadata_model.dart
@@ -6,8 +6,8 @@ class RawMetadata {
   final String title;
   final String artist;
   final String album;
-  final List<String> genres; // ⬅️ 改为 List<String>
-  final List<String> performers; // ⬅️ 新增
+  final List<String> genres;
+  final List<String> performers;
   final int year;
   final int trackNumber;
   final int trackTotal;
@@ -83,13 +83,26 @@ class NormalizedMetadata {
   bool get isNotEmpty => !isEmpty;
 }
 
+/// 候选元数据
+class CandidateMetadata {
+  final NormalizedMetadata metadata;
+  final double confidence;
+  final Map<String, double> evidence;
+
+  const CandidateMetadata({
+    required this.metadata,
+    required this.confidence,
+    this.evidence = const {},
+  });
+}
+
 /// 最终确认的元数据
 class FinalMetadata {
   final String title;
   final String artist;
   final String album;
-  final String genre; // ⬅️ 简化为单个流派（取第一个）
-  final List<String> genres; // ⬅️ 保留完整列表
+  final String genre;
+  final List<String> genres;
   final List<String> performers;
   final int year;
   final int trackNumber;
@@ -128,16 +141,3 @@ class FinalMetadata {
 
   bool get isNotEmpty => !isEmpty;
 }
-
-/// 候选元数据
-class CandidateMetadata {
-  final NormalizedMetadata metadata;
-  final double confidence;
-  final Map<String, double> evidence;
-
-  const CandidateMetadata({
-    required this.metadata,
-    required this.confidence,
-    this.evidence = const {},
-  });
-}
diff --git a/lib/metadata/metadata_normalizer.dart b/lib/metadata/metadata_normalizer.dart
index 07f94bf..2e082cb 100644
--- a/lib/metadata/metadata_normalizer.dart
+++ b/lib/metadata/metadata_normalizer.dart
@@ -4,19 +4,13 @@ import 'metadata_model.dart';
 class MetadataNormalizer {
   NormalizedMetadata normalize(RawMetadata raw,
       {String fileName = '', String filePath = ''}) {
-    // 1. 修剪
     final title = raw.title.trim();
     final artist = raw.artist.trim();
 
-    // 2. 如果 title 为空，从文件名推断
     final finalTitle =
         title.isNotEmpty ? title : _inferTitleFromFileName(fileName);
-
-    // 3. 如果 artist 为空，从路径推断
     final finalArtist =
         artist.isNotEmpty ? artist : _inferArtistFromPath(filePath);
-
-    // 4. 如果 performers 不为空且 artist 为空，使用 performers
     final finalArtist2 = finalArtist.isNotEmpty
         ? finalArtist
         : (raw.performers.isNotEmpty ? raw.performers.first : '未知艺术家');
@@ -57,6 +51,7 @@ class MetadataNormalizer {
 
   CandidateMetadata evaluate(
       NormalizedMetadata normalized, List<Map<String, dynamic>> history) {
+    // 第一版：直接接受，置信度 0.8
     return CandidateMetadata(
       metadata: normalized,
       confidence: 0.8,
diff --git a/lib/metadata/metadata_reader.dart b/lib/metadata/metadata_reader.dart
index 1863026..2d579c3 100644
--- a/lib/metadata/metadata_reader.dart
+++ b/lib/metadata/metadata_reader.dart
@@ -1,19 +1,25 @@
 // lib/metadata/metadata_reader.dart
 import 'dart:io';
-import 'package:flutter/foundation.dart'; // ⭐ 添加
+import 'package:flutter/foundation.dart';
 import 'package:audio_metadata_reader/audio_metadata_reader.dart' as amr;
 import 'metadata_model.dart';
 
 class MetadataReader {
   Future<RawMetadata> readRawMetadata(File file) async {
     try {
-      final meta = amr.readMetadata(file, getImage: false);
+      // ⭐ getImage: true 读取封面图
+      final meta = amr.readMetadata(file, getImage: true);
+
+      // ⭐ 提取第一张图片
+      Uint8List? artwork;
+      if (meta.pictures != null && meta.pictures!.isNotEmpty) {
+        artwork = meta.pictures.first.bytes;
+      }
 
       return RawMetadata(
         title: meta.title ?? '',
         artist: meta.artist ?? '',
         album: meta.album ?? '',
-        // ⭐ genres 和 performers 是非空 List<String>，不需要 ??
         genres: meta.genres,
         performers: meta.performers,
         year: _toInt(meta.year),
@@ -22,6 +28,7 @@ class MetadataReader {
         discNumber: _toInt(meta.discNumber),
         totalDisc: _toInt(meta.totalDisc),
         duration: meta.duration,
+        artwork: artwork,
       );
     } catch (e) {
       debugPrint('⚠️ [MetadataReader] read failed: $e');
diff --git a/lib/metadata/metadata_service.dart b/lib/metadata/metadata_service.dart
index fe41529..23bf673 100644
--- a/lib/metadata/metadata_service.dart
+++ b/lib/metadata/metadata_service.dart
@@ -1,11 +1,14 @@
 // lib/metadata/metadata_service.dart
-// ⭐ 移除未使用的 import 'dart:io';
-import 'package:flutter/foundation.dart'; // ⭐ 添加
+import 'dart:io'; // ⭐ 添加这一行
+import 'dart:typed_data'; // ⭐ 如果已经有更好
+import 'package:flutter/foundation.dart';
+import '../database/song_database.dart';
 import 'metadata_model.dart';
 import 'metadata_reader.dart';
 import 'metadata_normalizer.dart';
 import 'metadata_cache.dart';
 import 'file_provider.dart';
+import '../utils/artwork_helper.dart';
 
 class MetadataService {
   static final MetadataService _instance = MetadataService._internal();
@@ -14,7 +17,13 @@ class MetadataService {
 
   final MetadataReader _reader = MetadataReader();
   final MetadataNormalizer _normalizer = MetadataNormalizer();
-  final MetadataCache _cache = MetadataCache();
+  final MetadataCache _memoryCache = MetadataCache();
+  final SongDatabase _db = SongDatabase();
+
+  String _generateSongKey(String url, int fileSize, int modifiedTime) {
+    final raw = '$url|$fileSize|$modifiedTime';
+    return raw.hashCode.toString();
+  }
 
   FileProvider _getProvider(String url) {
     if (url.startsWith('http://') || url.startsWith('https://')) {
@@ -29,11 +38,11 @@ class MetadataService {
     required String fileId,
     bool forceRefresh = false,
   }) async {
-    // 1. 检查缓存
+    // 1. 内存缓存
     if (!forceRefresh) {
-      final cached = await _cache.get(fileId);
+      final cached = await _memoryCache.get(fileId);
       if (cached != null && cached.isNotEmpty) {
-        debugPrint('📦 [MetadataService] cache hit: ${cached.title}');
+        debugPrint('📦 [MetadataService] memory hit: ${cached.title}');
         return cached;
       }
     }
@@ -43,33 +52,96 @@ class MetadataService {
     final file = await provider.getFile(url);
 
     if (file == null || !await file.exists()) {
-      debugPrint(
-          '⚠️ [MetadataService] file not available, using filename fallback');
+      debugPrint('⚠️ [MetadataService] file not available, using fallback');
       return _fallbackFromFileName(fileName);
     }
 
-    // 3. 读取 metadata
+    final stat = await file.stat();
+    final songKey =
+        _generateSongKey(url, stat.size, stat.modified.millisecondsSinceEpoch);
+
+    // 3. SQLite 查询（高置信度直接使用）
+    if (!forceRefresh) {
+      final dbSong = await _db.getSong(songKey);
+      if (dbSong != null) {
+        final confidence = (dbSong['confidence'] as num?)?.toDouble() ?? 0.0;
+        if (confidence >= 0.6) {
+          debugPrint(
+              '📦 [MetadataService] SQLite hit: ${dbSong['title']} - ${dbSong['artist']}');
+
+          // 读取封面图
+          final artworkPath = dbSong['artwork_path'] as String?;
+          Uint8List? artwork;
+          if (artworkPath != null && artworkPath.isNotEmpty) {
+            try {
+              final artFile = File(artworkPath);
+              if (await artFile.exists()) {
+                artwork = await artFile.readAsBytes();
+              }
+            } catch (e) {
+              // ignore
+            }
+          }
+
+          final metadata = FinalMetadata(
+            title: dbSong['title'] as String? ?? '',
+            artist: dbSong['artist'] as String? ?? '',
+            album: dbSong['album'] as String? ?? '',
+            genre: dbSong['genre'] as String? ?? '',
+            artwork: artwork,
+            source: 'database',
+          );
+          await _memoryCache.put(fileId, metadata);
+          return metadata;
+        }
+      }
+    }
+
+    // 4. 读取原始 metadata
     final raw = await _reader.readRawMetadata(file);
 
-    // 4. 标准化
+    // 5. 标准化
     final normalized = _normalizer.normalize(
       raw,
       fileName: fileName,
       filePath: url,
     );
 
-    // 5. 评估（第一阶段：直接接受）
-    final history = await _cache.getHistory(normalized.artist, limit: 10);
+    // 6. 评估
+    final history = await _db.getSongsByArtist(normalized.artist, limit: 10);
     final candidate = _normalizer.evaluate(normalized, history);
     final finalMetadata = _normalizer.decide(candidate);
 
-    // 6. 缓存
-    if (finalMetadata.isNotEmpty) {
-      await _cache.put(fileId, finalMetadata);
-      debugPrint(
-          '✅ [MetadataService] metadata saved: ${finalMetadata.title} - ${finalMetadata.artist}');
+    // 7. 保存封面图到本地
+    String? artworkPath;
+    if (finalMetadata.artwork != null && finalMetadata.artwork!.isNotEmpty) {
+      artworkPath =
+          await ArtworkHelper.saveArtwork(finalMetadata.artwork!, songKey);
     }
 
+    // 8. 保存到 SQLite
+    await _db.insertSong({
+      'song_key': songKey,
+      'remote_path': url,
+      'file_size': stat.size,
+      'modified_time': stat.modified.millisecondsSinceEpoch,
+      'title': finalMetadata.title,
+      'artist': finalMetadata.artist,
+      'album': finalMetadata.album,
+      'genre': finalMetadata.genre,
+      'artwork_path': artworkPath,
+      'confidence': candidate.confidence,
+      'validation_count': 1,
+      'first_scan': DateTime.now().millisecondsSinceEpoch,
+      'last_scan': DateTime.now().millisecondsSinceEpoch,
+      'metadata_status': candidate.confidence >= 0.6 ? 'verified' : 'pending',
+    });
+
+    // 9. 内存缓存
+    await _memoryCache.put(fileId, finalMetadata);
+
+    debugPrint(
+        '✅ [MetadataService] saved: ${finalMetadata.title} - ${finalMetadata.artist} (confidence: ${candidate.confidence})');
     return finalMetadata;
   }
 
diff --git a/lib/pages/player_page.dart b/lib/pages/player_page.dart
index 68475e9..c629ee6 100644
--- a/lib/pages/player_page.dart
+++ b/lib/pages/player_page.dart
@@ -154,12 +154,17 @@ class _PlayerPageState extends State<PlayerPage> {
                     spreadRadius: 10,
                   ),
                 ],
+                image: song.artwork != null
+                    ? DecorationImage(
+                        image: MemoryImage(song.artwork!),
+                        fit: BoxFit.cover,
+                      )
+                    : null,
               ),
-              child: const Icon(
-                Icons.music_note,
-                size: 64,
-                color: Colors.white24,
-              ),
+              child: song.artwork == null
+                  ? const Icon(Icons.music_note,
+                      size: 64, color: Colors.white24)
+                  : null,
             ),
             const SizedBox(height: 48),
             Column(
diff --git a/lib/services/audio_player_handler.dart b/lib/services/audio_player_handler.dart
index f2ba0e9..5a91f56 100644
--- a/lib/services/audio_player_handler.dart
+++ b/lib/services/audio_player_handler.dart
@@ -1,5 +1,6 @@
 // lib/services/audio_player_handler.dart
-
+import 'dart:io'; // ⭐ 添加
+import 'dart:typed_data'; // ⭐ 添加
 import 'package:flutter/foundation.dart';
 import 'package:audio_service/audio_service.dart' as audio_service;
 import '../audio/player_controller.dart';
@@ -53,22 +54,6 @@ class AudioPlayerHandler extends audio_service.BaseAudioHandler {
     });
   }
 
-  void _updateMediaItemPosition(Duration position) {
-    final currentMediaItem = mediaItem.value;
-    if (currentMediaItem != null) {
-      mediaItem.add(audio_service.MediaItem(
-        id: currentMediaItem.id,
-        title: currentMediaItem.title,
-        artist: currentMediaItem.artist,
-        duration: currentMediaItem.duration,
-        extras: {
-          'position': position.inMilliseconds,
-          ...?currentMediaItem.extras,
-        },
-      ));
-    }
-  }
-
   void _publishState() {
     final state = _state.playbackState;
     playbackState.add(audio_service.PlaybackState(
@@ -111,38 +96,76 @@ class AudioPlayerHandler extends audio_service.BaseAudioHandler {
     );
   }
 
+  void updateNotification({
+    required String id,
+    required String title,
+    required String artist,
+    Uint8List? artwork,
+  }) {
+    _updateMediaItem(
+      id: id,
+      title: title,
+      artist: artist,
+      artwork: artwork,
+    );
+  }
+
   void _updateMediaItem({
     required String id,
     required String title,
     required String artist,
     Duration? duration,
+    Uint8List? artwork,
   }) {
     _currentId = id;
     _currentTitle = title;
     _currentArtist = artist;
     final position = _player.position;
 
-    debugPrint(
-        '📢 [handler] updateMediaItem: $title - $artist (position=${position.inSeconds}s)');
+    debugPrint('📢 [handler] updateMediaItem: $title - $artist');
+
+    // ⭐ 如果有 artwork，保存为临时文件并设置 artUri
+    Uri? artUri;
+    if (artwork != null && artwork.isNotEmpty) {
+      try {
+        final tempDir = Directory.systemTemp;
+        final artPath = '${tempDir.path}/art_${id.hashCode}.jpg';
+        final artFile = File(artPath);
+        artFile.writeAsBytesSync(artwork);
+        artUri = Uri.file(artPath);
+        debugPrint('📢 [handler] artwork saved: $artPath');
+      } catch (e) {
+        debugPrint('⚠️ [handler] save artwork failed: $e');
+      }
+    }
 
     mediaItem.add(audio_service.MediaItem(
       id: id,
       title: title,
       artist: artist,
       duration: duration ?? _player.duration,
+      artUri: artUri,
       extras: {
         'position': position.inMilliseconds,
       },
     ));
   }
 
-  void updateNotification({
-    required String id,
-    required String title,
-    required String artist,
-  }) {
-    _updateMediaItem(id: id, title: title, artist: artist);
-    _publishState();
+  void _updateMediaItemPosition(Duration position) {
+    final currentMediaItem = mediaItem.value;
+    if (currentMediaItem != null) {
+      mediaItem.add(audio_service.MediaItem(
+        id: currentMediaItem.id,
+        title: currentMediaItem.title,
+        artist: currentMediaItem.artist,
+        duration: currentMediaItem.duration,
+        artUri: currentMediaItem.artUri,
+        extras: {
+          'position': position.inMilliseconds,
+          ...?currentMediaItem.extras,
+        },
+      ));
+    }
   }
 
   @override
diff --git a/lib/services/audio_service.dart b/lib/services/audio_service.dart
index 1bf4d27..cea1f84 100644
--- a/lib/services/audio_service.dart
+++ b/lib/services/audio_service.dart
@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 import 'package:media_kit/media_kit.dart';
 import 'playback_service.dart';
 import '../metadata/metadata_service.dart';
+import 'dart:typed_data';
 
 enum PlayMode {
   sequential,
@@ -16,12 +17,14 @@ class Song {
   final String title;
   final String artist;
   final String? url;
+  final Uint8List? artwork;
 
   Song({
     required this.id,
     required this.title,
     required this.artist,
     this.url,
+    this.artwork,
   });
 }
 
@@ -181,6 +184,8 @@ class AudioService extends ChangeNotifier {
           title: metadata.title.isNotEmpty ? metadata.title : song.title,
           artist: metadata.artist.isNotEmpty ? metadata.artist : song.artist,
           url: song.url,
+          artwork: metadata.artwork,
+          // ⭐ 如果需要传递 artwork，可以在这里添加字段
         );
         _queue[_currentIndex] = updatedSong;
         _currentSong = updatedSong;
diff --git a/lib/utils/artwork_helper.dart b/lib/utils/artwork_helper.dart
new file mode 100644
index 0000000..c111967
--- /dev/null
+++ b/lib/utils/artwork_helper.dart
@@ -0,0 +1,55 @@
+// lib/utils/artwork_helper.dart
+import 'dart:io';
+import 'dart:typed_data';
+import 'package:path_provider/path_provider.dart';
+
+class ArtworkHelper {
+  static const String _artworkDir = 'artworks';
+
+  /// 保存封面图到本地
+  static Future<String?> saveArtwork(Uint8List data, String songKey) async {
+    try {
+      final dir = await getApplicationDocumentsDirectory();
+      final artworkDir = Directory('${dir.path}/$_artworkDir');
+      if (!await artworkDir.exists()) {
+        await artworkDir.create(recursive: true);
+      }
+
+      final path = '${artworkDir.path}/$songKey.jpg';
+      final file = File(path);
+      await file.writeAsBytes(data);
+      return path;
+    } catch (e) {
+      return null;
+    }
+  }
+
+  /// 获取封面图文件
+  static Future<File?> getArtwork(String songKey) async {
+    try {
+      final dir = await getApplicationDocumentsDirectory();
+      final path = '${dir.path}/$_artworkDir/$songKey.jpg';
+      final file = File(path);
+      if (await file.exists()) {
+        return file;
+      }
+      return null;
+    } catch (e) {
+      return null;
+    }
+  }
+
+  /// 删除封面图
+  static Future<void> deleteArtwork(String songKey) async {
+    try {
+      final dir = await getApplicationDocumentsDirectory();
+      final path = '${dir.path}/$_artworkDir/$songKey.jpg';
+      final file = File(path);
+      if (await file.exists()) {
+        await file.delete();
+      }
+    } catch (e) {
+      // ignore
+    }
+  }
+}
diff --git a/pubspec.lock b/pubspec.lock
index 60d0ce9..ed680dc 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -433,7 +433,7 @@ packages:
     source: hosted
     version: "3.0.0"
   path:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: path
       sha256: "75cca69d1490965be98c73ceaea117e8a04dd21217b37b292c9ddbec0d955bc5"
diff --git a/pubspec.yaml b/pubspec.yaml
index c78b3e6..0990ae1 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -43,6 +43,7 @@ dependencies:
   sqflite: ^2.3.0
   audio_metadata_reader: ^1.7.1
   path_provider: ^2.1.0
+  path: ^1.9.0
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.