diff --git a/bin/backup.sh b/bin/backup.sh
index 38e3933..067c32f 100755
--- a/bin/backup.sh
+++ b/bin/backup.sh
@@ -317,9 +317,16 @@ merge_backups() {
     fi
 
     # 合并打包
-    tar -czf "${final_backup}" -C "${TEMP_DIR}" \
-        $(basename "${folders_tar}" 2>/dev/null || true) \
-        $(basename "${mysql_dump}" 2>/dev/null || true)
+    # 构建相对于 TEMP_DIR 的路径列表
+    local files_list=""
+    if [[ -n "${folders_tar}" ]] && [[ -f "${folders_tar}" ]]; then
+        files_list+=" ${folders_tar#${TEMP_DIR}/}"
+    fi
+    if [[ -n "${mysql_dump}" ]] && [[ -f "${mysql_dump}" ]]; then
+        files_list+=" ${mysql_dump#${TEMP_DIR}/}"
+    fi
+
+    tar -czf "${final_backup}" -C "${TEMP_DIR}" ${files_list}
 
     if [[ -f "${final_backup}" ]]; then
         local file_size=$(du -h "${final_backup}" | cut -f1)