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Phase-shifting reactor (PSR) can be used to solve the harmonic problems caused by rectifiers. In this paper, according to the active power balance principle, the relationships among the DC current of the loads, the currents of power supply side, and the capacity of core limb are built, the product specification of winding and core are obtained. Meanwhile, the coupled fieldcircuit method based on Simplorer and Maxwell, and the circuit method based on MATLAB/Simulink are discussed by the simulation of the 6-phase rectifier system. The results show that the designed PSR meets the requirement well, and suppresses the harmonic of power supply side effectively.