A burgeoning cloud computing brought up the topic of virtualization in recent years. The leading manufacturers in information field, including Microsoft, Intel, IBM, have invested substantial resources in this aspect of virtualization. However there are still some security worries in virtualization architecture. The virtual environment is quite dynamic, and therefore it is more important to perform data backup and disaster recovery for safety management. This paper discusses the virtualization platform, virtual machine, desktop virtualization security issues, and implements disaster recovery mechanism for virtualization environment.