Abstract: In order to improve the control performance of Buck converter, the voltage control scheme of Buck converter based on model reference adaptive control is studied. Firstly, small-signal model of Buck converter is built based on small signal disturbance method. Then the design principles of adaptive reference model is analyzed and presented, the design steps is also summarized. Besides, design method of adaptive controller, values and influences of key parameters are concluded. Finally, frequency-domain and time-domain simulation model are built in Matlab/Simulink platform, the important conclusions in this paper areverified by simulation results. The simulation results prove that MIT MRAC scheme is feasible and effective to Buck converter control.