In 1970¡¦s, by applying the field-oriented analysis method, the decoupling of motor speed (motor torque) and rotor flux is obtained. However, the performance is rather sensitive to the variation of motor parameters, especially the motor time constant, which varies with the temperature and saturation of magnetizing inductance. In this thesis, the model following based £g design for induction motor speed control is studied. Roughly speaking, the model following component provides a reference model with desired closed-loop performance and the £g component provides a systematic synthesis procedure so that, under practical uncertainty and load disturbance, the goal of asymptotic model following is achieved.