diff --git a/README.md b/README.md
index 515f102..0f7f43b 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ bash reinstall.sh centos-7 (或其他系统)
 bash reinstall.sh windows --iso=https://example.com/zh-cn_windows_10_enterprise_ltsc_2021_x64_dvd_033b7312.iso --image-name='Windows 10 Enterprise LTSC 2021'
 
 dd:
-bash reinstall.sh dd --ddimg=https://example.com/xxx.gz
+bash reinstall.sh dd --img=https://example.com/xxx.gz
 
 重启:
 reboot
diff --git a/reinstall.sh b/reinstall.sh
index 1aeac50..8305fb9 100644
--- a/reinstall.sh
+++ b/reinstall.sh
@@ -128,13 +128,13 @@ setos() {
     }
 
     setos_dd() {
-        if [ -z "$ddimg" ]; then
-            echo "dd need --ddimg"
+        if [ -z "$img" ]; then
+            echo "dd need --img"
             exit 1
         fi
-        test_url $ddimg 'xz|gz'
-        eval "${step}_ddimg='$ddimg'"
-        eval "${step}_ddimg_type='$img_type'"
+        test_url $img 'xz|gz'
+        eval "${step}_img='$img'"
+        eval "${step}_img_type='$img_type'"
     }
 
     setos_redhat() {
@@ -250,7 +250,7 @@ if [ "$EUID" -ne 0 ]; then
     exit 1
 fi
 
-if ! opts=$(getopt -a -n $0 --options l --long localtest,iso:,image-name:,ddimg: -- "$@"); then
+if ! opts=$(getopt -a -n $0 --options l --long localtest,iso:,image-name:,img: -- "$@"); then
     usage_and_exit
 fi
 
@@ -262,8 +262,8 @@ while true; do
         confhome=$localtest_confhome
         shift
         ;;
-    --ddimg)
-        ddimg=$2
+    --img)
+        img=$2
         shift 2
         ;;
     --iso)
diff --git a/trans.sh b/trans.sh
index ac0da76..0378e07 100644
--- a/trans.sh
+++ b/trans.sh
@@ -91,7 +91,7 @@ if [ "$distro" = "alpine" ]; then
     exec reboot
 
 elif [ "$distro" = "dd" ]; then
-    case "$ddimg_type" in
+    case "$img_type" in
     gz) prog=gzip ;;
     xz) prog=xz ;;
     esac
@@ -99,7 +99,7 @@ elif [ "$distro" = "dd" ]; then
     if [ -n "$prog" ]; then
         # alpine busybox 自带 gzip xz，但官方版也许性能更好
         apk add curl $prog
-        curl -L $ddimg | $prog -dc >/dev/$xda
+        curl -L $img | $prog -dc >/dev/$xda
     else
         echo 'Not supported'
         sleep 1m