diff --git a/wake/View/Components/Upload/MediaPicker.swift b/wake/View/Components/Upload/MediaPicker.swift
index e10dc01..9153f20 100644
--- a/wake/View/Components/Upload/MediaPicker.swift
+++ b/wake/View/Components/Upload/MediaPicker.swift
@@ -36,16 +36,64 @@ public enum MediaType: Equatable {
     }
 }
 
+enum MediaTypeFilter {
+    case imagesOnly
+    case videosOnly
+    case all
+    
+    var pickerFilter: PHPickerFilter {
+        switch self {
+        case .imagesOnly: return .images
+        case .videosOnly: return .videos
+        case .all: return .any(of: [.videos, .images])
+        }
+    }
+}
+
 struct MediaPicker: UIViewControllerRepresentable {
     @Binding var selectedMedia: [MediaType]
     let imageSelectionLimit: Int
     let videoSelectionLimit: Int
     let onDismiss: (() -> Void)?
+    let allowedMediaTypes: MediaTypeFilter
+    
+    init(selectedMedia: Binding<[MediaType]>, 
+         imageSelectionLimit: Int = 10, 
+         videoSelectionLimit: Int = 10,
+         allowedMediaTypes: MediaTypeFilter = .all,
+         onDismiss: (() -> Void)? = nil) {
+        self._selectedMedia = selectedMedia
+        self.imageSelectionLimit = imageSelectionLimit
+        self.videoSelectionLimit = videoSelectionLimit
+        self.allowedMediaTypes = allowedMediaTypes
+        self.onDismiss = onDismiss
+    }
+    
+    func makeUIViewController(context: Context) -> PHPickerViewController {
+        var configuration = PHPickerConfiguration(photoLibrary: PHPhotoLibrary.shared())
+        configuration.filter = allowedMediaTypes.pickerFilter
+        configuration.selectionLimit = 0 // 设置为0表示不限制选择数量，我们在代码中处理
+        configuration.preferredAssetRepresentationMode = .current
+        
+        let picker = PHPickerViewController(configuration: configuration)
+        picker.delegate = context.coordinator
+        context.coordinator.currentPicker = picker
+        
+        return picker
+    }
+    
+    func updateUIViewController(_ uiViewController: PHPickerViewController, context: Context) {
+        // 更新视图控制器（如果需要）
+    }
+    
+    func makeCoordinator() -> Coordinator {
+        Coordinator(self)
+    }
     
     class Coordinator: NSObject, PHPickerViewControllerDelegate {
         let parent: MediaPicker
         private let logger = Logger(subsystem: Bundle.main.bundleIdentifier ?? "com.example.app", category: "MediaPicker")
-        internal var currentPicker: PHPickerViewController?  // 将 private 修改为 internal
+        internal var currentPicker: PHPickerViewController?
         
         init(_ parent: MediaPicker) {
             self.parent = parent
@@ -75,8 +123,12 @@ struct MediaPicker: UIViewControllerRepresentable {
             for result in results {
                 let itemProvider = result.itemProvider
                 if itemProvider.hasItemConformingToTypeIdentifier(UTType.image.identifier) {
+                    // 检查是否允许选择图片
+                    guard parent.allowedMediaTypes != .videosOnly else { continue }
                     newImages += 1
                 } else if itemProvider.hasItemConformingToTypeIdentifier(UTType.movie.identifier) {
+                    // 检查是否允许选择视频
+                    guard parent.allowedMediaTypes != .imagesOnly else { continue }
                     newVideos += 1
                 }
             }
@@ -89,10 +141,10 @@ struct MediaPicker: UIViewControllerRepresentable {
                 var message = "选择超出限制：\n"
                 var limits: [String] = []
                 
-                if currentImageCount + newImages > parent.imageSelectionLimit {
+                if currentImageCount + newImages > parent.imageSelectionLimit && parent.allowedMediaTypes != .videosOnly {
                     limits.append("图片最多选择\(parent.imageSelectionLimit)张")
                 }
-                if currentVideoCount + newVideos > parent.videoSelectionLimit {
+                if currentVideoCount + newVideos > parent.videoSelectionLimit && parent.allowedMediaTypes != .imagesOnly {
                     limits.append("视频最多选择\(parent.videoSelectionLimit)个")
                 }
                 
@@ -113,7 +165,7 @@ struct MediaPicker: UIViewControllerRepresentable {
                 return
             }
             
-            // 如果没有超出限制，处理选择的媒体
+            // 处理选择的媒体
             processSelectedMedia(results: results, picker: picker)
         }
         
@@ -125,6 +177,9 @@ struct MediaPicker: UIViewControllerRepresentable {
                 let itemProvider = result.itemProvider
                 
                 if itemProvider.hasItemConformingToTypeIdentifier(UTType.image.identifier) {
+                    // 检查是否允许选择图片
+                    guard parent.allowedMediaTypes != .videosOnly else { continue }
+                    
                     group.enter()
                     processImage(itemProvider: itemProvider) { media in
                         if let media = media {
@@ -135,6 +190,9 @@ struct MediaPicker: UIViewControllerRepresentable {
                         group.leave()
                     }
                 } else if itemProvider.hasItemConformingToTypeIdentifier(UTType.movie.identifier) {
+                    // 检查是否允许选择视频
+                    guard parent.allowedMediaTypes != .imagesOnly else { continue }
+                    
                     group.enter()
                     processVideo(itemProvider: itemProvider) { media in
                         if let media = media {
@@ -183,14 +241,10 @@ struct MediaPicker: UIViewControllerRepresentable {
                     }
                     try FileManager.default.copyItem(at: videoURL, to: targetURL)
                     
-                    MediaUtils.extractFirstFrame(from: targetURL) { result in
-                        switch result {
-                        case .success(let thumbnail):
-                            completion(.video(targetURL, thumbnail))
-                        case .failure(let error):
-                            self.logger.error("Failed to extract video thumbnail: \(error.localizedDescription)")
-                            completion(.video(targetURL, nil))
-                        }
+                    if let thumbnail = self.generateThumbnail(for: targetURL) {
+                        completion(.video(targetURL, thumbnail))
+                    } else {
+                        completion(.video(targetURL, nil))
                     }
                 } catch {
                     self.logger.error("Failed to copy video file: \(error.localizedDescription)")
@@ -198,26 +252,19 @@ struct MediaPicker: UIViewControllerRepresentable {
                 }
             }
         }
-    }
-    
-    func makeUIViewController(context: Context) -> PHPickerViewController {
-        var configuration = PHPickerConfiguration(photoLibrary: PHPhotoLibrary.shared())
-        configuration.filter = .any(of: [.videos, .images])
-        configuration.selectionLimit = 0 // 设置为0表示不限制选择数量，我们在代码中处理
-        configuration.preferredAssetRepresentationMode = .current
         
-        let picker = PHPickerViewController(configuration: configuration)
-        picker.delegate = context.coordinator
-        context.coordinator.currentPicker = picker
-        
-        return picker
-    }
-    
-    func updateUIViewController(_ uiViewController: PHPickerViewController, context: Context) {
-        // 更新视图控制器（如果需要）
-    }
-    
-    func makeCoordinator() -> Coordinator {
-        Coordinator(self)
+        private func generateThumbnail(for videoURL: URL) -> UIImage? {
+            let asset = AVAsset(url: videoURL)
+            let imageGenerator = AVAssetImageGenerator(asset: asset)
+            imageGenerator.appliesPreferredTrackTransform = true
+            
+            do {
+                let cgImage = try imageGenerator.copyCGImage(at: CMTime(seconds: 0, preferredTimescale: 1), actualTime: nil)
+                return UIImage(cgImage: cgImage)
+            } catch {
+                logger.error("Failed to generate thumbnail: \(error.localizedDescription)")
+                return nil
+            }
+        }
     }
 }
diff --git a/wake/View/Examples/MediaDemo.swift b/wake/View/Examples/MediaDemo.swift
index a53bbed..a7578d6 100644
--- a/wake/View/Examples/MediaDemo.swift
+++ b/wake/View/Examples/MediaDemo.swift
@@ -25,8 +25,9 @@ struct MediaUploadDemo: View {
                 .sheet(isPresented: $showMediaPicker) {
                     MediaPicker(
                         selectedMedia: $uploadManager.selectedMedia,
-                        imageSelectionLimit: 2,
-                        videoSelectionLimit: 2,
+                        imageSelectionLimit: 1,
+                        videoSelectionLimit: 0,
+                        allowedMediaTypes: .imagesOnly,
                         onDismiss: {
                             showMediaPicker = false
                             // 当媒体选择器关闭时，如果有选中的媒体，开始上传