The motor speed accuracy is an important performance index of the servo system. The traditional PI control cannot meet the high precision requirements of servo system. The application of advanced control strategy to permanent magnet synchronous motor is the development trend of servo system. This paper introduces the application of the precision velocity measurement method and the advanced control strategy of the permanent magnet synchronous motor in the motor speed system, analyzes the advantages and disadvantages and the scope of the various methods, summarizes the latest research results and the problems to be solved, and the future The research direction is forecasted.