In the government’ s e-government activities,a lot of government information,the citizen privacy information and so on will be produced,and high degree security of those information in general need to be guaranteed,in order to prevent the loss and disclosure or un-authorized access for information. At the same time,e-government services involving multi-level sharing and localization of storage re-sources,big data processing and many other issues on the cloud computing platform,therefore e-government big data service model needs to be established to meet the future needs of e-government service based on cloud computing platform. In this paper,present e-govern-ment security platform model based on cloud computing in the age of big data. The platform is not only to be able to support the e-gov-ernment service mode,meeting the e-government security requirements,but also can adapt to large data environment background,while supporting operation mechanism of cloud computing. With the development of e-government security problems,how to use the emerging cloud computing technology,guarantee the security of e-government,which has an important practical significance.%政府在开展电子政务的活动中，会产生出大量的政务信息、公民隐私资料等等。而这些信息需要高度的安全性保障，以防止信息丢失、信息外泄或非法访问。同时云计算平台下电子政务服务涉及资源多级共享和本地化存储、大数据处理等众多问题，因此需要建立全面的云计算平台下电子政务大数据服务模式以适应未来的电子政务服务需求。文中提出了大数据时代基于云计算的电子政务安全平台模型。该平台不仅要能够支持上述电子政务服务模式、满足电子政务安全需求，还能够适应大数据环境背景，同时支持云计算的运行机制。随着电子政务安全问题不断涌现，如何借助新兴的云计算技术，保障电子政务安全，这一研究具有重要的现实意义。
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