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FTP is one of the important application systems in campus network.But most FTP servers have bottleneck in their performances,which causes low utilization to the resource.Therefore,according to the actual demand of the network in high schools,the working principle of existing FTP softwares was analyzed.The node number and processing rate of servers were further studied.Then based on multithreading principle,the queue theory models of FTP servers were put forward.By the analysis of bandwidth utilization,response time and processing rate of the nodes,corresponding improved schemes were also proposed.

In the experiment teaching of computer network service, it is difficult to use the physical operating environment, so the method of virtual experiment environment of network service is put forward. By using C # programming technology and database technology in the server, we can use the third party micro free green server software to automatically start service, to set up a domain name, to define an account, and to create an e-mail, so that we can automatically install and start the mail service, and automatically create the domain name and account information. We can also huild a virtual FTP server and create corresponding FTP virtual directory, mail and FTP account information for administrators and each student. We can quickly huild the virtual environment for computer network server hy one key, and create each students account in large quantities. These measures can help teachers to make a unified management of students ' operations. When the students test in the client, the client program is automatically set to access the account to achieve the test of network services, so that the experimental efficiency is greatly improved. [ABSTRACT FROM AUTHOR]