Abstract: When DC/DC power modules are used in parallel, it is generally necessary for each module to achieve a current-sharing operating state. This paper introduces the active parallel current sharing method based on average current or maximum current by analyzing the working state and output characteristic curve of parallel DC/DC power module. The current sharing bus voltage corresponding to the average current or maximum current is amplified and compared with the output current sampling value of each signal module, the reference voltage value of the PWM circuit is adjusted, then the output voltage can be adjusted, the parallel power module achieves the purpose of parallel current sharing.