Voltage control of power systems is one of the key links in maintaining the power system voltage level. Based on the model predictive control（MPC） theory and method， a distributed control model and structure are obtained by employing the decomposition-coordination technology and the auxiliary problem principle to realize the decoupling of the mathematical model and structure of voltage predictive control. Thus the global centralized optimization problem is decomposed into some sub-problems that are only related to their local model and information and can be solved in a distributed manner. It is beneficial to reducing the dimensions of the optimization problem and improving the flexibility and security of control and calculation. Some simulations conducted on a typical power network indicate that the proposed method can effectively control the power system voltage level and prevent voltage instability， as well as obtain a control performance similar to the centralized MPC.