Abstract: In order to drive the repetitive nanosecond pulse discharge reliably, a repetitive nanosecond pulse power supply based on blowing switch is designed, which can output quasi square pulse with variable amplitudes and pulse widths of tens to hundreds of nanoseconds. Under the experimental conditions, the maximum effective frequency of the output pulse can exceed 1.5kHz. The power supply uses the principle of pulse forming line to generate high voltage nanosecond pulse. The switch adopts the coaxial structure of blowing type self-breakdown gas switch, and the fan blowing is used to speed up the insulation recovery speed of the gas switch, so as to improve the limit working frequency of the gas switch. The experimental results show that the insulation recovery of the gas switch is poor without blowing fan, and there are many low-voltage breakdown processes. Therefore, the shorter the pulse forming line is, the lower the effective frequency limit of the pulse power supply will be. After the blower being used, the low voltage breakdown of the switch is suppressed to some extent, and the effective frequency limit of the pulse power supply increases with the shortening of the pulse forming line length. The faster the wind speed of the fan is, the better the insulation recovery of the gas switch will be, and the higher the effective working frequency of the pulse power supply will be. Finally, the dielectric barrier discharge module with parallel plate structure has successfully been driven by this repetitive nanosecond pulse power supply.