diff --git a/src/core.sh b/src/core.sh
index 13d6ba6..7359f2e 100644
--- a/src/core.sh
+++ b/src/core.sh
@@ -150,6 +150,24 @@ get_port() {
     done
 }
 
+update_caddyfile_fallback() {
+    [[ ! -f $is_caddyfile ]] && return
+    # Backup Caddyfile
+    cp -f $is_caddyfile ${is_caddyfile}.bak
+    
+    # 1. Replace servers :443 with servers :4443
+    sed -i 's/servers :443/servers :4443/g' $is_caddyfile
+    
+    # 2. Replace any site block headers explicit :443 with :4443
+    sed -i 's/:443[[:space:]]*{/:4443 {/g' $is_caddyfile
+    
+    # 3. Add https_port 4443 to global block if not present
+    if [[ ! $(grep "https_port 4443" $is_caddyfile) ]]; then
+        # Find first { and insert https_port 4443 on the next line
+        sed -i '0,/^[[:space:]]*{[[:space:]]*$/s//{\n  https_port 4443/' $is_caddyfile
+    fi
+}
+
 get_pbk() {
     is_tmp_pbk=($($is_core_bin generate reality-keypair | sed 's/.*://'))
     is_public_key=${is_tmp_pbk[1]}
@@ -360,6 +378,15 @@ create() {
             # config.json
             create config.json
         fi
+        # If reality fallback is enabled, automatically update Caddyfile!
+        if [[ $is_reality_fallback ]]; then
+            msg "\n自动调整 Caddy 配置文件以支持 4443 端口回落..."
+            update_caddyfile_fallback
+            msg "Caddy 配置文件更新成功，备份已保存至 ${is_caddyfile}.bak"
+            msg "正在重启 Caddy 以释放 443 端口..."
+            manage restart caddy &>/dev/null
+            sleep 1
+        fi
         # caddy auto tls
         [[ $is_caddy && $host && ! $is_no_auto_tls ]] && {
             create caddy $net
@@ -1519,11 +1546,10 @@ info() {
     fi
     if [[ $is_reality_fallback ]]; then
         msg "------------- REALITY Fallback NOTICE -------------"
-        warn "由于启用了 Caddy 回落分流，你必须手动配置 Caddy 才能使整体网络生效："
-        msg "1. 请将你的 ${yellow}/etc/caddy/Caddyfile${none} 中的默认 https 端口修改为 ${green}4443${none}。"
-        msg "   例如，在全局配置块中添加: ${cyan}https_port 4443${none}，或者将 site 域名改为 ${cyan}yourdomain.com:4443${none}"
-        msg "2. 修改后，请运行命令重启 Caddy ➔ ${green}systemctl restart caddy${none}"
-        msg "3. 如果 sing-box 启动失败，请检查 Caddy 是否已成功释放了 443 端口。"
+        _green "检测到启用了 Caddy 回落分流，脚本已自动为你调整了 Caddy 配置文件："
+        msg "1. 已自动将你的 ${yellow}/etc/caddy/Caddyfile${none} 中的默认 https 端口修改为 ${green}4443${none}。"
+        msg "2. 原配置文件备份已保存至 ${yellow}${is_caddyfile}.bak${none}。"
+        msg "3. Caddy 和 sing-box 已自动重启，现在 443 端口由 sing-box 监听，普通流量会自动分流回落至 Caddy。"
         msg "---------------------------------------------------"
     fi
     footer_msg