Cloud computing, as a new computing mode allows the user to get through the network all kinds of resources and services, including all kinds of Internet applications and run the application platform and virtualization of computing and storage resources. Cloud computing in the cloud by the infrastructure cloud, cloud platform and application of cloud, accordingly can also by the infrastructure layer, platform layer and application layer to differentiate cloud architecture, each layer in the cloud computing can provide service for the user, and the formation of the ancillary services, the main form of these services are as follows: