Abstract:

Cloud computing is the hottest technology discussed in the Internet recently，and it is considered as the development trend of the Internet.With the further implementation of cloud computing，the security issues of cloud computing become the one focus of the most dramatic.This article introduces the basic concept and characteristic of cloud computing，combined with the characteristics of cloud computing，focuses on threats and countermeasures of data security management，application management and virtualization security management in the cloud environment.

Key words: cloud computing, infrastructure as a service, platform as a service, software as a service, application security, cloud service provider