Information security realizing method and system based on digital certificate

A method of realizing information security and system based on a digital certificate, the method comprising: respectively issuing a digital certificate for a cloud management host, a cloud calculation physical host and a cloud calculation virtual machine; and when the cloud management host, the cloud calculation physical host and the cloud calculation virtual machine start up or are running, conducting a compliance certificate according to a corresponding digital certificate. The method of realizing information security and system based on the digital certificate provided by an embodiment of the present invention use the technology of a digital certificate trust link for reference, combine with a cloud management system to realize the trust system of the cloud management system, the physical host and the virtual machine, and emphasize the security protection of a system host platform, thus improving the security of a cloud virtual platform.