diff --git a/CustomKeyboard/Resource/002.zip b/CustomKeyboard/Resource/002.zip
index f241135..3823509 100644
Binary files a/CustomKeyboard/Resource/002.zip and b/CustomKeyboard/Resource/002.zip differ
diff --git a/Shared/KBSkinManager.m b/Shared/KBSkinManager.m
index 7e527b3..545ea06 100644
--- a/Shared/KBSkinManager.m
+++ b/Shared/KBSkinManager.m
@@ -129,7 +129,11 @@ static void KBSkinDarwinCallback(CFNotificationCenterRef center, void *observer,
 }
 
 - (BOOL)applyImageSkinWithData:(NSData *)imageData skinId:(NSString *)skinId name:(NSString *)name {
+    // 仅作为“存在背景图”的标记使用：图像文件本身存放在 App Group 容器
+    // Skins/<skinId>/background.png 中，这里不再把二进制图片写入 Keychain，
+    // 避免卸载 App 后仍残留旧背景图。
     if (imageData.length == 0) return NO;
+
     // 构造新主题，继承当前配色作为按键/强调色的默认值
     KBSkinTheme *base = self.current ?: [self.class defaultTheme];
     KBSkinTheme *t = [KBSkinTheme new];
@@ -143,14 +147,34 @@ static void KBSkinDarwinCallback(CFNotificationCenterRef center, void *observer,
     // 继承按键文本隐藏配置和图标映射，避免仅切换背景时丢失这些设置
     t.hiddenKeyTextIdentifiers = base.hiddenKeyTextIdentifiers;
     t.keyIconMap = base.keyIconMap;
-    t.backgroundImageData = imageData;
+    // 不再把背景图二进制存进主题（从而写入 Keychain），统一改为按 skinId
+    // 从 App Group 容器读取 Skins/<skinId>/background.png。
+    t.backgroundImageData = nil;
     return [self applyTheme:t];
 }
 
 - (UIImage *)currentBackgroundImage {
-    NSData *d = self.current.backgroundImageData;
-    if (d.length == 0) return nil;
-    return [UIImage imageWithData:d scale:[UIScreen mainScreen].scale] ?: nil;
+    // 新策略：始终从 App Group 容器按 skinId 读取背景图文件，
+    // 确保当 AppGroup 目录被系统清理时，背景图与按键图标一起消失，
+    // 不再依赖 Keychain 中可能残留的 backgroundImageData。
+    NSString *skinId = self.current.skinId;
+    if (skinId.length == 0) return nil;
+
+    NSURL *containerURL = [[NSFileManager defaultManager] containerURLForSecurityApplicationGroupIdentifier:AppGroup];
+    if (!containerURL) return nil;
+
+    NSString *relative = [NSString stringWithFormat:@"Skins/%@/background.png", skinId];
+    NSString *bgPath = [[containerURL.path stringByAppendingPathComponent:relative] stringByStandardizingPath];
+
+    NSFileManager *fm = [NSFileManager defaultManager];
+    BOOL isDir = NO;
+    if (![fm fileExistsAtPath:bgPath isDirectory:&isDir] || isDir) {
+        return nil;
+    }
+
+    NSData *data = [NSData dataWithContentsOfFile:bgPath];
+    if (data.length == 0) return nil;
+    return [UIImage imageWithData:data scale:[UIScreen mainScreen].scale] ?: nil;
 }
 
 - (BOOL)shouldHideKeyTextForIdentifier:(NSString *)identifier {