摘要： 介绍了网络的不安全性，从网络安全预防的角度分析了网络安全扫描器的工作原理，介绍了几种扫描技术，在该基础上，设计和实现了一个网络安全扫描器，并进行了详细的分析，归纳了该系统的应用特点，并指出了进一步需要做的工作。

关键词: 网络安全；漏洞扫描器；服务器

Abstract: Hole scanner is a software that can be used to detect the vulnerability for the local and net host. By using it, the bug of system can be found out. The reason of network’s insecurity is firstly put forward, the work principles of scanner is also analyzed. Secondly, a net hole scanner is designed and implementated, application characteristic is concluded, and the following betterment is shown clearly

Key words: Network security; Hole scanner; Server