Matrix Converter (MC) has the characteristics of power direct conversion, which makes the performance of the output side easily affected by the disturbance, so it is very necessary to control the MC system. Due to the nonlinearity, multivariable and parameter variability of MC, the mathematical model can not be determined. Therefore, it is not so successful to design a single closed-loop control system with PI constant under the condition of unstable internal and external disturbances. An Auto Disturbance Rejection Controller (ADRC) which is independent of the object model is applied to the MC system. And in order to solve the problem that the non-smooth non-linear function of the ADRC control module causes the harmonic component of the MC output system is increased. On the basis of ADRC, the nonlinear function of the auto ADRC module is improved and its control loop is simplified. Experimental results show that when the ADRC is used for the MC system to control the adjustment, the control effect is superior to PI control both in the condition of harmonic pollution on the input side of the grid itself or under the condition of abnormal grid voltage. This work is supported by National Natural Science Foundation of China (No. U1404522) and National Key Research and Development Program of China (No. 2016YFC0600906).