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A Dynamic Migration Strategy of Virtual Machine in Cloud computing environments called DMS-VM was proposed and discussed in this paper.First, a virtual machine migration scenario is assumed under the cloud computing environment. In this situation, multiple application service requests are dynamically changed, and the application services provided with the virtual machine are one to one. Secondly, a multi-objective programming model based on multiple constraints is proposed, and a genetic algorithm is designed as the main migration strategy of the virtual machine. In order to evaluate the performance of DMS-VM,a serial of test had been done.The experimental results show that DMS-VM can effectively reduce the number of physical machine usage and the number of migration virtual machines conpared with the common strategy. The energy consumption of data center had also obtained in our test.