diff --git a/AIStudyApp/AIStudyApp/Features/Library/LibrarySubpages.swift b/AIStudyApp/AIStudyApp/Features/Library/LibrarySubpages.swift
index cda0cc1..afcd4b2 100644
--- a/AIStudyApp/AIStudyApp/Features/Library/LibrarySubpages.swift
+++ b/AIStudyApp/AIStudyApp/Features/Library/LibrarySubpages.swift
@@ -13,7 +13,7 @@ struct CreateLibraryPage: View {
             ScrollView { VStack(spacing: 20) {
                 // 封面
                 VStack(alignment: .leading, spacing: 8) {
-                    Text("封面图（可选，3:2）").font(.system(size: 12, weight: .semibold)).foregroundColor(Color.zxF035)
+                    Text("封面图（可选，正方形）").font(.system(size: 12, weight: .semibold)).foregroundColor(Color.zxF035)
                     Button { showCoverPicker = true } label: {
                         ZStack {
                             RoundedRectangle(cornerRadius: 14).fill(Color.zxFill004)
@@ -73,7 +73,7 @@ struct CreateLibraryPage: View {
         defer { isUploadingCover = false; coverPhotoItem = nil }
         guard let data = try? await item.loadTransferable(type: Data.self),
               let image = UIImage(data: data) else { return }
-        let resized = resizeCoverImage(image, tw: 600, th: 400)
+        let resized = resizeCoverImage(image, tw: 512, th: 512)
         do {
             let r = try await FileUploadService.shared.uploadImageWithKey(resized, filename: "cover_\(Int(Date().timeIntervalSince1970)).jpg")
             coverKey = r.objectKey; coverImage = resized