diff --git a/debian.cfg b/debian.cfg
index 1a10008..68bdb54 100644
--- a/debian.cfg
+++ b/debian.cfg
@@ -67,8 +67,8 @@ d-i finish-install/reboot_in_progress note
 
 # B.5.1. 安装过程中运行用户命令
 d-i preseed/early_command string \
-  wget http://www.cloudflare.com/cdn-cgi/trace -O- | grep -x 'loc=CN' && hostname=ftp.cn.debian.org || hostname=deb.debian.org; \
-  debconf-set mirror/http/hostname $hostname
+  hostname="$(grep -o 'extra\.deb_hostname=[^ ]*' /proc/cmdline | cut -d= -f2)"; \
+  debconf-set mirror/http/hostname "$hostname"
 
 d-i partman/early_command string \
   debconf-set partman-auto/disk "$(list-devices disk | head -n1)"; \
diff --git a/reinstall.sh b/reinstall.sh
index 21eea15..586d376 100644
--- a/reinstall.sh
+++ b/reinstall.sh
@@ -311,11 +311,13 @@ setos() {
         else
             # 传统安装
             if is_in_china; then
-                hostname=ftp.cn.debian.org
+                # 部分国内机无法访问 ftp.cn.debian.org
+                deb_hostname=mirrors.tuna.tsinghua.edu.cn
             else
-                hostname=deb.debian.org
+                deb_hostname=deb.debian.org
             fi
-            mirror=http://$hostname/debian/dists/$codename/main/installer-$basearch_alt/current/images/netboot/debian-installer/$basearch_alt
+
+            mirror=http://$deb_hostname/debian/dists/$codename/main/installer-$basearch_alt/current/images/netboot/debian-installer/$basearch_alt
             eval ${step}_vmlinuz=$mirror/linux
             eval ${step}_initrd=$mirror/initrd.gz
             eval ${step}_ks=$confhome/debian.cfg
@@ -325,6 +327,7 @@ setos() {
             [ "$releasever" -eq 10 ] && [ "$basearch_alt" = amd64 ] && flavour=
             # shellcheck disable=SC2034
             kernel=linux-image$flavour-$basearch_alt
+
         fi
     }
 
@@ -1083,7 +1086,7 @@ build_finalos_cmdline() {
 }
 
 build_extra_cmdline() {
-    for key in confhome hold cloud_image kernel; do
+    for key in confhome hold cloud_image kernel deb_hostname; do
         value=${!key}
         if [ -n "$value" ]; then
             extra_cmdline+=" extra.$key='$value'"