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To meet the demand of high speed machining and high precision micro feed processing, a high precision position servo control system is studied in this paper for permanent magnet linear synchronous motor PMLSM which has the characteristic of high electromagnetism thrust-intensity, fast response time and easiness to realize vector decoupling control etc. Considering the controlled object change and external disturbance, and it is difficult to adjust the controller parameters online, a fuzzy / integration-proportion IP position controller is proposed which combines the IP controller with the parallel feedback loop with the fuzzy controller effectively. The combined controller will be switched according to the change rate of position deviation, that is, the fuzzy controller is adopted when the input command is large and the system output error is large, and the IP controller is used when the system output is close to the input command, and thus makes use of the fuzzy controller's adaptability to the variable parameter system and the advantages of fast and accurate IP controller. The simulation results show that fuzzy/IP controller is better than the IP controller and fuzzy controller in the steady-state accuracy and dynamic performance, which can satisfy the performance index of the variable parameter system.