diff --git a/application/models/Proftp.php b/application/models/Proftp.php
new file mode 100644
index 00000000..3fc9e043
--- /dev/null
+++ b/application/models/Proftp.php
@@ -0,0 +1,58 @@
+<?php
+class Proftp
+{
+	public $db;
+	public $pwd;
+	public $time;
+	function __construct()
+	{
+	}
+	function createuser($user)
+	{
+		//只插入到users表中
+		$sql=$this->db->quoteInto("select * from proftpusers where userid=?",$user->username);
+		$u=$this->db->fetchRow($sql);
+		if (empty($u))
+		{
+			$sql=$this->db->quoteInto("insert into proftpusers (userid,passwd,uid,gid,homedir) values(?,?,109,1002,?)",$user->username,$user->userpass,'/home/ftp/'.$user->username);
+			$this->db->query($sql);						
+			$sql=$this->db->quoteInto("select pkid from proftpusers where userid=?",$user->username);
+			$a=$this->db->fetchRow($sql);
+			$userid = $a['pkid'];
+		} else $userid=$u['id'];//g6ftp中的用户ID，非系统的用户ID
+		$this->pwd=$user->password;//初始化
+		$this->time=$user->time;
+		//判断用户密码是否失效，或用户一次下载数据已经达到上限
+		$sql=$this->db->quoteInto("select * from ftpuser where userid=?",$user->id);
+		$u=$this->db->fetchRow($sql);
+		if (empty($u)) {
+			//插入ftpuser信息
+			$sql="insert into ftpuser (userid,pwd,ts_created,ts_invalid,datacount) values(?,?,now(),?,1)";
+			$this->db->query($sql,array($user->id,$user->password,$user->time));
+			//todo: create users home directory
+			return true;
+		} elseif (strtotime($u['ts_invalid'])<=time() or $u['datacount']<1) {
+			//更新用户密码、数据地址和数据计数
+			//数据地址覆盖原来的信息
+			//todo: 重置用户目录下的可用文件/目录。
+			$sql=$this->db->quoteInto("update proftpusers set passwd=? where userid=?",$user->password,$user->username);
+			$this->db->query($sql); 
+			$sql="update ftpuser set pwd=?,ts_created=now(),ts_invalid=?,datacount=1 where userid=?";
+			$this->db->query($sql,array($user->password,$user->time,$user->id));
+			return true;			
+		} elseif (strtotime($u['ts_invalid'])>time() && $u['datacount']<$user->maxdata) {
+			//更新数据地址和数据计数
+			//数据地址要追加在原来的后面
+			//需要判断数据是否已经在下载进程中
+			$sql="update ftpuser set ts_invalid=?,datacount=? where userid=?";
+			$this->db->query($sql,array($user->time,$user->datacount+1,$user->id));
+			$sql="select pwd,ts_invalid from ftpuser where userid=?";
+			$u=$this->db->fetchRow($sql,array($user->id));
+			$this->pwd=$u['pwd'];
+			$this->time=$u['ts_invalid'];			
+			return true;		
+		} else //同时下载数据数超过限制
+			return false;
+	}	
+}
+?>
\ No newline at end of file