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为改善Buck变换器的控制性能，对基于模型参考自适应控制的Buck变换器电压控制方案进行了研究。首先基于小信号扰动法建立了Buck变换器的小信号解析模型；然后分析给出了自适应参考模型的设计依据，总结了设计步骤，并对自适应控制器的设计方法、关键参数的取值和影响进行了归纳；最后在Matlab／Simu-link平台下搭建了频域和时域仿真模型，对文中重要结论进行了验证，证实了MIT MRAC用于Buck变换器控制的可行性和有效性。“,”In order to improve the control performance of Buck converter,the voltage control scheme of Buck con-verter 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 ana-lyzed and presented,the design steps is also summarized.Besides,design method of adaptive controller,val-ues 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.