Based on the actual demand for highspeed operation of multimotor system in industrial occasions, the advantages and disadvantages of traditional multimotor control system and traditional flux weakening control system were analyzed. The flux weakening characteristics of multimotor system under the highspeed operation were discussed. Model predictive control (MPC) was a new control algorithm based on the controlled object model, which had strong robustness and better control performance. Crosscoupling control was a control system which compensated each motor on the basis of parallel control. MPC was applied to multimotor control system and the ability of flux weakening control was improved. The traditional crosscoupling control strategy was also improved. A model prediction synchronous control strategy for multimotor flux weakening control was proposed based on the combination of the two strategies. Taking the simulation of dualmotor system as an example, the simulation results show that the multimotor flux weakening synchronous control strategy based on model prediction has better tracking performance and synchronous performance than the traditional control system.