diff --git a/update.sh b/update.sh
index cb2c7ff..cc34856 100644
--- a/update.sh
+++ b/update.sh
@@ -1,12 +1,66 @@
 #!bash
 
+if [ $# -eq 0 ]; then
+  echo "
+"$0" -i|u [-b branch]
+        i       a new install with empty config.
+        u       update use exist config.
+        b       install the branch after parameter b, default master
+
+example:
+        "$0" -i
+        "$0" -u
+        "$0" -b master
+        "$0" -r -b master
+        "$0" -ib test
+"
+#  exit
+  echo "###############
+0, new install
+1, update"
+  read -p "Input:" c
+  [ g"$c" == g"0" ] && install=1
+  [ g"$c" == g"1" ] && update=1
+fi
+
+i=0
+para[$i]=$0
+for av in "$@"
+do
+#echo $av
+  ((i++))
+  para[$i]=$av
+  if [ g"${av:0:1}" == g"-" ]; then
+    while [ g"$av" != g"" ]
+    do
+      ag=${av:0:1}
+      av=${av:1}
+      [ g"$ag" == g"b" ] && isbranch=1
+      [ g"$ag" == g"i" ] && install=1
+      [ g"$ag" == g"u" ] && update=1
+    done
+  else
+    if [ g"$isbranch" == g"1" ]; then
+      branch="-b $av"
+      isbranch=0
+    fi
+  fi
+done
+
+if [ g"$install" != g"1" -a g"$update" != g"1" ]; then
+  echo "Not install & Not update, exit"
+  exit
+fi
+#echo $branch
+#echo $install
+
 gitsource='https://github.com/qkqpttgf/OneManager-php'
 
 OneManagerPath=`cd $(dirname $0);pwd -P`
 cd ${OneManagerPath}
 
-git clone ${gitsource}
-\mv -b config.php OneManager-php/
+git clone ${branch} ${gitsource}
+[ g"$install" == g"1" ] || \mv -b config.php OneManager-php/
 \mv -b OneManager-php/* ./
 \mv -b OneManager-php/.[^.]* ./
 rm -rf *~