The development of new energy technology requires the power electronic equipment to increase power constantly, which leads to the generation of parallel system of power electronic equipment. In this paper, the reason of zero-sequence current of parallel converter was analyzed by analyzing the multiple parallel converter system mean value model. Then two methods of reducing zero-sequence current was proposed. To further analyze the effect of the two methods, a SIMULINK model was established. The simulation results show that both the PI control and deadbeat control can suppress the zero-sequence flow. But the control effect of PI control is more stable and more suitable for practical application.