随着信息技术的发展，传统的信息系统正逐渐被多租户的SaaS 系统所替代。这种系统能显著减少企业的开 发、实施和维护成本，也为客户减少了使用成本，但同时也面临着更多的安全问题。本文通过分析多租户SaaS 应用系统架构的 特点，详解了每种架构可能面临的安全风险，并给出了安全加固的建议。

Traditional information system is being replaced by the SaaS system along with the development of the information technology. This architecture can dramatically decrease the cost of the development, implementation and maintenance of the enterprise. However, the problems come along with it. The security issues are concerned by the users in most cases. This article analyzes the architecture of Multi-Tenancy SaaS information system and gives security enhancement advice by inspecting the security risk of this architecture.