Abstract: A speed-sensorless vector control system was established based on the fundamental equations of a vector control of induction motor.Rotor-speedestimation used the theory of model referencing adaptive control(MRAC).In order to improve the performance of the vector control system,three fuzzy PID controllers were presented and designed to control speed,torque and magnetic linkage respectively in the indirect vector control system.Simulation result showed that this way has a good control performance.