This paper addresses the problem of wide speed range sensorless control of induction motor. The proposed method is based on model reference adaptive system(MRAS), in which the current model serves as the adjustable model,and a novel hybrid model integrating the modified voltage model(MVM) and high-frequency signal injection method(HF-SIM) are established to serve as the reference model. The HFSIM works together with MVM to improve the performance of the rotor speed and rotor flux position estimation at low speed, whereas at high speed, the MVM acts alone. In addition,a rotor resistance online estimation scheme is proposed to update the rotor resistance contained in the adjustable model and to ensure the estimation accuracy further. Experimental results show that the proposed MRAS method is very effective from low to high speed range, including zero speed.