diff --git a/h-hosts-docker.sh b/h-hosts-docker.sh
index aac1826..0aa4996 100644
--- a/h-hosts-docker.sh
+++ b/h-hosts-docker.sh
@@ -51,8 +51,9 @@ if [ ! -f "$DAEMON_FILE" ] || [ ! -s "$DAEMON_FILE" ]; then
 fi
 
 # 2. 备份当前配置文件
-cp "$DAEMON_FILE" "$DAEMON_FILE.bak-$(date +%Y%m%d_%H%M%S)"
-echo "📄  已将当前配置备份到 '$DAEMON_FILE.bak-$(date +%Y%m%d_%H%M%S)'"
+BACKUP_FILE="$DAEMON_FILE.bak-$(date +%Y%m%d_%H%M%S)"
+cp "$DAEMON_FILE" "$BACKUP_FILE"
+echo "📄  已将当前配置备份到 '$BACKUP_FILE'"
 
 # 3. 将所有命令行参数转换为 jq 可以使用的 JSON 数组
 #    例如: "host1:ip1" "host2:ip2" -> '["host1:ip1", "host2:ip2"]'
@@ -67,14 +68,14 @@ hosts_to_add_json=$(jq -n '$ARGS.positional' --args "$@")
 updated_json=$(jq \
   --argjson hosts_to_add "$hosts_to_add_json" \
   '.add_host = ((.add_host // []) + $hosts_to_add | unique | del(select(.==null)))' \
-  "$DAEMON_FILE.bak")
+  "$BACKUP_FILE")
 
 # 5. 将格式化后的 JSON 写回主文件
 echo "$updated_json" > "$DAEMON_FILE"
 
 # 6. 显示修改前后的差异
 echo "🔄  检查文件变更:"
-diff -u "$DAEMON_FILE.bak" "$DAEMON_FILE"
+diff -u "$BACKUP_FILE" "$DAEMON_FILE"
 
 if [ $? -eq 0 ]; then
     echo "✅  配置未发生变化，所有条目均已存在。"