The invention discloses a transferring method of a cross-data center virtual machine under a cloud computation environment. The transferring method comprises the following steps: establishing an image repository of an operating system; when a user establishes a virtual machine embodiment based on an image of the operating system in the image repository, storing the image of the operating system of the virtual machine embodiment by adopting a manner of adding an independent increment file to the shared image of the operating system; after any one source data center receives a cross-data center virtual machine transferring instruction which is sent by an operator and is used for transferring a target virtual machine to a target data center from a source data center, sequentially carrying out transferring pre-processing of the virtual machine, cross-data center virtual machine increment file synchronization, cross-data center transferring of the virtual machine and processing after transferring the virtual machine, so as to finish the cross-data center transferring of the virtual machine. The transferring method of the cross-data center virtual machine under the cloud computation environment has the advantages that the transferring method does not depend on supporting of shared storage, reading and writing of rear-end data do not need a data channel established on Internet, high efficiency of disaster recovery backup, small occupied storage space and rapid backup speed.