diff --git a/tools/get.dotfiles.cn b/tools/get.dotfiles.cn
index 98951c5..c038eb9 100644
--- a/tools/get.dotfiles.cn
+++ b/tools/get.dotfiles.cn
@@ -1,48 +1,53 @@
 #!/bin/bash
 set -e
-
 ARG=""
 GOT_OPTS=()
-while [[ $# > 0 || -n "$ARG" ]]; do
-    if [[ -z "$ARG" ]]; then ARG=$1; shift; fi
+DFS_USER="$(whoami)"
+while [[ $# > 0||-n "$ARG" ]];do
+    if [[ -z "$ARG" ]];then ARG=$1;shift;fi
     case $ARG in
-        -s*|--secure ) DFS_SECURE=1 ;;
-        -u*|--user ) 
-            if [[ "$ARG" == --*=* ]]; then
+        -s*|--secure)DFS_SECURE=1;;
+        -u*|--user)if [[ "$ARG" == --*=* ]];then
                 DFS_USER="${ARG#*=}"
             else
                 DFS_USER=$1
                 shift
             fi
-            if [[ -z "$DFS_USER" ]]; then
+            if [[ -z "$DFS_USER" ]];then
                 echo "install user is required"
                 exit 1
-            fi
-            ;;
-        --*=* ) GOT_OPTS+=("${ARG%%=*}" "${ARG#*=}") ;;
-        --* ) GOT_OPTS+=("$ARG") ;;
-        -* ) GOT_OPTS+=("${ARG:0:2}") ;;
-        *  ) GOT_OPTS+=("$ARG") ;;
+            fi;;
+        --*=*)GOT_OPTS+=("${ARG%%=*}" "${ARG#*=}");;
+        --*)GOT_OPTS+=("$ARG");;
+        -*)GOT_OPTS+=("${ARG:0:2}");;
+        *)GOT_OPTS+=("$ARG");;
     esac
-    if [[ "$ARG" == "--"* || ! "$ARG" == "-"* || ${#ARG} -le 2 ]]; then
+    if [[ "$ARG" == "--"*||! "$ARG" == "-"*||${#ARG} -le 2 ]];then
         ARG=""
     else
         ARG=-${ARG:2}
     fi
 done
-
-# install TODO: multiple users; remove -a after installed for the first user
-if command -v su 1>/dev/null && test -n "$DFS_USER" && test "$DFS_USER" != "$(whoami)"; then
-    SUCMD="su $DFS_USER"
-else
-    SUCMD="bash"
-fi
-$SUCMD << EOF
+IFS=',' read -r -a DFS_USERS<<<"$DFS_USER"
+for u in "${DFS_USERS[@]}";do
+    if [[ -z "$u" ]];then
+        continue
+    fi
+    if ! id -u "$u" >/dev/null 2>&1;then
+        echo "user $u not exists"
+        exit 1
+    fi
+    if [[ "$u" == "$(whoami)" ]];then
+        SUCMD="bash"
+    else
+        SUCMD="su $u"
+    fi
+    $SUCMD<<EOF
 cd
-if [[ ! -f ~/dotfiles/install.sh ]]; then
+if [[ ! -f ~/dotfiles/install.sh ]];then
     git clone https://gitee.com/dictxiong/dotfiles
 fi
-if [[ "$DFS_SECURE" == "1" ]]; then
+if [[ "$DFS_SECURE" == "1" ]];then
     echo "enter secure mode"
     cd dotfiles
     git fetch --all
@@ -51,4 +56,5 @@ if [[ "$DFS_SECURE" == "1" ]]; then
 fi
 ./dotfiles/install.sh ${GOT_OPTS[@]}
 zsh -c "source ~/.zshrc"
-EOF
\ No newline at end of file
+EOF
+done