The working state of the magnetic field power supply control circuits for CINRAD/SA Radar is described. Diagrams of the corresponding standard waveforms are given by means of debugging the driving signals of FET and the control panel, voltage waveforms between electrodes of IGBT modules, and some other test points of the circuits. After debugging the output voltage, the voltage protection of power supply, and the current protection of focus coil by steps, the flowchart of fault treatment is accomplished with the physical test points, real fault phenomena, and solutions. Based on the practical experiences, correlative troubleshooting points and solutions are summarized, aiming to offer some references for the spot fault treatment of radar magnetic field power supply.