1: install vsftpd.
apt-get install vsftpd
2:configure /etc/vsftpd.conf
vi /etc/vsftpd.conf
uncomment below statement
#local_enable=YES
#write_enable=YES
3:after configuration in step 2,directory /srv/ftp and a usergroup named ftp was added automatically by the system cat /etc/shadow|grep ftp
4:useradd&password
useradd -g ftpgroup -d /home/benson/ -M ftpuser
passwd ftpuser
5: chmod /home/benson
chmod 777 /home/benson
6:start vsftpd
service vsftpd restart or /etc/init.d/vsftpd start
7:now you can use the ftp client in windows such as 8uFTP