diff --git a/box/scripts/box.service b/box/scripts/box.service
index 72d2b67..9f28375 100755
--- a/box/scripts/box.service
+++ b/box/scripts/box.service
@@ -69,7 +69,6 @@ check_permission() {
     chmod 0644 "${data_dir}/${bin_name}"/*
     # Set ownership of data directory
     chown -R ${box_user_group} ${data_dir}
-    nohup="nohup busybox setuidgid ${box_user_group}"
     log info "Use the kernel located in '${bin_path}'."
   elif which ${bin_name} | grep -q "/system/bin/"; then
     box_user=$(echo ${box_user_group} | busybox awk -F ':' '{print $1}')
@@ -77,25 +76,26 @@ check_permission() {
     box_user_id=$(id -u ${box_user})
     box_group_id=$(id -g ${box_group})
     # Check if box_user and box_group exist
-    if [[ ${box_user_id} && ${box_group_id} ]]; then
-      bin_path=$(which ${bin_name})
-      # Set ownership and permission of kernel directory
-      chown ${box_user_group} ${bin_path}
-      chmod 6755 ${bin_path}
-      chmod 0644 "${data_dir}/${bin_name}"/*
-      # Check if user is not root and group is not net_admin
-      if [[ "${box_user_id}" != "0" || "${box_group_id}" != "3005" ]]; then
-        # Set capability of kernel directory
-        if ! setcap 'cap_net_admin,cap_net_raw,cap_net_bind_service+ep' "${bin_path}"; then
-          box_user_group="root:net_admin"
-          log error "setcap authorization failed, you may need libcap package."
-        fi
-      fi
-      # Set ownership of data directory
-      chown -R ${box_user_group} ${data_dir}
-      nohup="nohup"
-      log info "Using kernel directory ${bin_name} in ${bin_path}"
+    if ! [[ ${box_user_id} && ${box_group_id} ]]; then
+     log error "${box_user_group} error, use root:net_admin instead." 
+     box_user_group="root:net_admin"
     fi
+    bin_path=$(which ${bin_name})
+    # Set ownership and permission of kernel directory
+    chown ${box_user_group} ${bin_path}
+    chmod 6755 ${bin_path}
+    chmod 0644 "${data_dir}/${bin_name}"/*
+    # Check if user is not root and group is not net_admin
+    if [[ "${box_user_id}" != "0" || "${box_group_id}" != "3005" ]]; then
+      # Set capability of kernel directory
+      if ! setcap 'cap_net_admin,cap_net_raw,cap_net_bind_service+ep' "${bin_path}"; then
+        log error "setcap authorization failed, you may need libcap package."
+      fi
+    fi
+    # Set ownership of data directory
+    box_user_group="root:net_admin"
+    log info "Using kernel directory ${bin_name} in ${bin_path}"
+    chown -R ${box_user_group} ${data_dir}
   else
     sed -i "s/box_user_group=.*/box_user_group=\"root:net_admin\"/g" ${settings}
     log error "Kernel '${bin_name}' is missing."
@@ -221,7 +221,7 @@ run_box() {
     sing-box)
       prepare_singbox
       if ${bin_path} check -D "${data_dir}/${bin_name}" --config-directory "${data_dir}/sing-box" > "${run_path}/${bin_name}-report.log" 2>&1 ; then
-        "${nohup}" ${bin_path} run -D "${data_dir}/${bin_name}" --config-directory "${data_dir}/sing-box" > "${run_path}/${bin_name}.log" 2>&1 &
+        nohup busybox setuidgid ${box_user_group} ${bin_path} run -D "${data_dir}/${bin_name}" --config-directory "${data_dir}/sing-box" > "${run_path}/${bin_name}.log" 2>&1 &
         echo -n $! > "${pid_file}"
       else
         log error "Configuration failed, please check the ${run_path}/${bin_name}-report.log file."
@@ -234,7 +234,7 @@ run_box() {
     clash)
       prepare_clash
       if ${bin_path} -t -d "${data_dir}/${bin_name}" -f "${clash_config}" > "${run_path}/${bin_name}-report.log" 2>&1; then
-        "${nohup}" ${bin_path} -d "${data_dir}/${bin_name}" -f "${clash_config}" > "${run_path}/${bin_name}.log" 2>&1 &
+        nohup busybox setuidgid ${box_user_group} ${bin_path} -d "${data_dir}/${bin_name}" -f "${clash_config}" > "${run_path}/${bin_name}.log" 2>&1 &
         echo -n $! > "${pid_file}"
       else
         log error "configuration failed, please check the ${run_path}/${bin_name}-report.log file."
@@ -253,7 +253,7 @@ run_box() {
       export XRAY_LOCATION_ASSET="${data_dir}/${bin_name}"
       export XRAY_LOCATION_CONFDIR="${data_dir}/${bin_name}"
       if ${bin_path} -test > "${run_path}/${bin_name}-report.log" 2>&1; then
-        "${nohup}" ${bin_path} > "${run_path}/${bin_name}.log" 2>&1 &
+        nohup busybox setuidgid ${box_user_group} ${bin_path} > "${run_path}/${bin_name}.log" 2>&1 &
         echo -n $! > "${pid_file}"
       else
         log error "configuration failed, please check the ${run_path}/${bin_name}-report.log file."
@@ -272,7 +272,7 @@ run_box() {
       export V2RAY_LOCATION_ASSET="${data_dir}/${bin_name}"
       export V2RAY_LOCATION_CONFDIR="${data_dir}/${bin_name}"
       if (${bin_path} test > "${run_path}/${bin_name}-report.log" 2>&1) ; then
-        "${nohup}" ${bin_path} run > "${run_path}/${bin_name}.log" 2>&1 &
+        nohup busybox setuidgid ${box_user_group} ${bin_path} run > "${run_path}/${bin_name}.log" 2>&1 &
         echo -n $! > ${pid_file}
       else
         log error "configuration failed, please check the ${run_path}/${bin_name}-report.log file."