diff --git a/backup_new.sh b/backup_new.sh
index 0effdcf..8e791a4 100755
--- a/backup_new.sh
+++ b/backup_new.sh
@@ -32,10 +32,6 @@ badParam () {
         printf "${err}\nError: '%s %s': Service does not exist!${norm}\n\n" \
             "$2" "$3"
         exit 1    
-    elif [ "$1" = "user" ]; then
-        printf "${err}\nError: '%s %s': User does not exist!${norm}\n\n" \
-            "$2" "$3"
-        exit 1
     fi
 }
 
@@ -95,7 +91,6 @@ webroot="/usr/share/nginx/html"
 offlineBackup=0
 seafService="seafile.service"
 seafHub="seahub.service"
-seafUser="seafile"
 seafDir="/opt/seafile"
 seafData="/var/seafile"
 
@@ -224,19 +219,6 @@ while [ $# -gt 0 ]; do
             # shutdown seafile during backup
             offlineBackup=1
             ;;
-        -u|--user|--seafuser)
-            # name of seafile system user
-            if [ -n "$2" ]; then
-                if ! id "$2" > /dev/null 2>&1; then
-                    badParam user "$@"
-                else
-                    seafUser="${2%/}"
-                    shift
-                fi
-            else
-                badParam empty "$@"
-            fi
-            ;;
         *)
             printf "${err}\nUnknown option: %s\n" "$1"
             printf "${cyan}Use '--help' for valid options.{$norm}\n\n"