With the popularization of cloud computing, solving the power shortage problem of mobile devices in a cloud way comes into the eyes. And migrating the whole virtual machine which can save cost for both developers and users has been realized. This paper redefine the function migration problem, and use a dynamic programming algorithm to solve it. This paper releases all functions based on COMET. 3 groups of experiment are conducted, and give speed-up of 7.11x, 23.23x, 8.24x.