This paper discusses the private network NGN system security solutions. An in-depth analysis is supplied in this paper about the system security problem when Softswitch system is deployed in private network, and also the implementation of the deployment of Softswitch system is proposed under the framework of Softswitch network security domain, on the basis of particular introduction of all network security solutions, an security policy of core network domain is proposed in terms of both network security and equipment security.%针对软交换系统在专网部署时所面临的系统安全性问题进行了深入的分析，对网络安全问题的解决策略进行了简要说明，提出了在软交换系统网络安全域的构架下解决系统安全问题的方法，分析了各网络安全域所面临的安全风险，并对软交换系统实施中各网络域安全性解决方案分别进行了说明，从网络安全和设备安全两方面给出了核心网络域的安全策略和网络安全实施方案。
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