Abstract: Improving the conditioning uniformity of the vacuum interrupter and effectively regulating the mode and amount of energy injection in the conditioning arc area are two core problems to be solved by the vacuum interrupter conditioning technology. However, in a single power supply mode, the breakdown conditions of the contact gap of the vacuum interrupter and the discharge energy of the arc are mutually restricted, and the time and space constraints of the conditioning are difficult to adjust independently, which is difficult to simultaneously meet the requirements of conditioning for both uniformity and energy regulation in the action area. This paper proposes a dual-power conditioning technology scheme for vacuum interrupters with high voltage pulse superimposed on DC voltage, which achieves breakdown and precise positioning of insulation weaknesses in contact gaps through small-energy high-voltage pulses, and introduces a large current to conditioning the weak areas. Compared with the experimental results of the traditional conditioning method, the conditioning method in this paper can be adopted to significantly improve the lightning impulse withstand voltage level of the vacuum interrupter by about 40%, providing a new idea for the further development of the vacuum interrupter conditioning technology.