Cloud computing is a technology that used for distributed computing, on a network. It is meant network-based services that these services are provided by virtual ISPs. Virtual machine migration has been thought as one of the crucial technologies that improving data center efficiency, such as maintaining load balance and reducing energy cost. However, traditional approaches of could not avoid the service interruption completely. These techniques are deficient, when the entire cluster needs to be migrated. In these methods, moreover, they often result in longer delay and are liable to failures. In this paper, the authors discussed the migration techniques existing today and propose a new approach of VM migration.