Security has been regarded as one of the greatest problems in the development of cloud computing. The trusted computing provides the hardware-based protection for cloud computing security based on TPM. While vTPM using in cloud environment still faces technical challenges, among which VM-vTPM live migration has been unsolved yet. In this paper, the trusted VM-vTPM live migration scene in clouds and its security and performance requirements are analyzed. Furthermore, a trusted VM-vTPM live migration protocol and its detailed design are presented.