To study magnetic valve type controlled reactor (MCR) of the hysteresis loop and the characteristics of the output current under the working conditions of the dc bias, according to the experimental data of MCR under dc bias, build the neural network hysteresis model, get the hysteresis loop. coupled circuit and magnetic circuit of MCR, get the winding output current..Compared them with the experimental waveforms, basic consistent. It Shows the correctness of the model. provide an effective method.for the research of magnetic control reactor partial magnetic.