diff --git a/install.sh b/install.sh
index 2f6c60f..0fd7942 100644
--- a/install.sh
+++ b/install.sh
@@ -1837,30 +1837,55 @@ update_pull_latest_code() {
     # 克隆最新代码
     git clone "$REPO_URL" "${PROJECT_NAME}-update"
 
-    # 删除旧的代码文件（保留data和storage）
-    cd "$PROJECT_DIR"
-    find . -maxdepth 1 ! -name 'backend' ! -name '.' -exec rm -rf {} + 2>/dev/null || true
-
-    if [[ -d "backend" ]]; then
-        cd backend
-        find . -maxdepth 1 ! -name 'data' ! -name 'storage' ! -name '.env' ! -name '.' -exec rm -rf {} + 2>/dev/null || true
-        cd ..
+    # 更新前端文件
+    print_info "更新前端文件..."
+    if [[ -d "/tmp/${PROJECT_NAME}-update/frontend" ]]; then
+        rm -rf "${PROJECT_DIR}/frontend"
+        cp -r "/tmp/${PROJECT_NAME}-update/frontend" "${PROJECT_DIR}/"
     fi
 
-    # 复制新代码
-    cp -r "/tmp/${PROJECT_NAME}-update"/* "$PROJECT_DIR/" 2>/dev/null || true
+    # 更新上传工具
+    if [[ -d "/tmp/${PROJECT_NAME}-update/upload-tool" ]]; then
+        rm -rf "${PROJECT_DIR}/upload-tool"
+        cp -r "/tmp/${PROJECT_NAME}-update/upload-tool" "${PROJECT_DIR}/"
+    fi
 
-    # 恢复重要文件
-    if [[ -d "$TEMP_BACKUP/data" ]]; then
+    # 更新后端代码文件（但不覆盖 data、storage、.env）
+    print_info "更新后端代码..."
+    if [[ -d "/tmp/${PROJECT_NAME}-update/backend" ]]; then
+        cd "/tmp/${PROJECT_NAME}-update/backend"
+
+        # 复制后端文件，但排除 data、storage、.env、node_modules
+        for item in *; do
+            if [[ "$item" != "data" ]] && [[ "$item" != "storage" ]] && [[ "$item" != ".env" ]] && [[ "$item" != "node_modules" ]]; then
+                rm -rf "${PROJECT_DIR}/backend/$item"
+                cp -r "$item" "${PROJECT_DIR}/backend/"
+            fi
+        done
+    fi
+
+    # 确保备份的重要文件存在
+    print_info "确保数据完整性..."
+
+    # 如果 data 目录不存在，从备份恢复
+    if [[ ! -d "${PROJECT_DIR}/backend/data" ]] && [[ -d "$TEMP_BACKUP/data" ]]; then
+        print_warning "检测到 data 目录丢失，正在从备份恢复..."
         cp -r "$TEMP_BACKUP/data" "${PROJECT_DIR}/backend/"
+        print_success "数据库已恢复"
     fi
 
-    if [[ -d "$TEMP_BACKUP/storage" ]]; then
+    # 如果 storage 目录不存在，从备份恢复
+    if [[ ! -d "${PROJECT_DIR}/backend/storage" ]] && [[ -d "$TEMP_BACKUP/storage" ]]; then
+        print_warning "检测到 storage 目录丢失，正在从备份恢复..."
         cp -r "$TEMP_BACKUP/storage" "${PROJECT_DIR}/backend/"
+        print_success "用户文件已恢复"
     fi
 
-    if [[ -f "$TEMP_BACKUP/.env" ]]; then
+    # 如果 .env 文件不存在，从备份恢复
+    if [[ ! -f "${PROJECT_DIR}/backend/.env" ]] && [[ -f "$TEMP_BACKUP/.env" ]]; then
+        print_warning "检测到 .env 文件丢失，正在从备份恢复..."
         cp "$TEMP_BACKUP/.env" "${PROJECT_DIR}/backend/"
+        print_success "配置文件已恢复"
     fi
 
     # 清理临时文件