Abstract: this paper discussed four network security problems-network insecurity problems network security classification network security policy and network security measure.

文摘：从网络所面临的威胁、网络安全等级、网络安全策略和网络安全措施等四个方面，分析与探讨网络安全问题。

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Some research point out, the majority of network security threatens from the system interior, so we are urgent need to use one kind of new measure and the technology safeguard the network security.

有研究指出，大部分的网络安全威胁来自系统内部，因此，我们迫切的需要采用一种新的措施和技术来保障网络的安全。

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Network security is more and mose important, so that the demand of network defense measure is more urgent.

人们对网络安全越来越关注，对网络安全防范措施的需求也更为迫切。

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