Abstract: In order to achieve the purpose of suppressing the peak current harmonics of the power grid after the laser pulse output, a method suitable for active power factor correction in pulsed power applications was used. Theoretical analysis and experimental verification were performed. The results show that its operating frequency is 75kHz, output voltage is 380V, output voltage ripple is less than 2%, the total harmonic content after correction is reduced to 10%, and the power factor reaches 98%; active power factor correction technology achieves power factor correction under pulse power applications, which is effective to improve the energy transfer efficiency and the stability of the output pulse energy. This study will help to improve the performance of the laser and meet its application needs in scientific research and medical fields.