On the basis of previous research, the control strategy of permanent magnet synchronous motor (PMSM) with high speed of load capacity was promoted, and the control strategy could overcome the weakness that the motor at the highest speed could not be loaded, high reliability and easy to implement. The algorithm of the control strategy includes the weak magnetic control of PMSM and the over modulation control of voltage space vector, so that the motor could be controlled in a wide range of speed. In order to verify the control strategy, the simulation model of interior permanent magnet synchronous motor (IPMSM) was built, the experimental platform was built, the simulation and experiment were carried out, and the feasibility and effectiveness of the control strategy were verified by simulation and experiment.