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Aiming at the load unbalance problem of cloud computing virtual machine, a load balance strategy based on GM(1,1) prediction and virtual machine migration is proposed. Firstly, the load balance principle is described and the classic ELB algorithm is introduced, and the defects is summarized. Then the load balance algorithm based on GM(1,1) is designed, the load information can be predicted based on history load information. It can realize add and delete of the virtual machines relying on the current load of ELB algorithm. The threshold can be set as different values for add, delete and migration. Finally, the load balance algorithm based on prediction mechanism and virtual machine migration is defined. The experiment is operated in the CloudSim, the experiment shows the method in this paper can realize the load balance in cloud computing virtual machine, and compared with the other methods, it has high load balance and load balance efficiency, therefore, it is an effective load balance strategy in cloud computing.