Abstract: In order to generate a high-energy plasma synthetic jet, a compact microsecond-pulse power supply is developed and tested. The maximum output voltage is 10 kV with a pulse repetition rate of 100 Hz and the generator can withstand a discharge current with an amplitude of 250 A. Moreover, the working principle of the generator is introduced and the effect of different capacitor on the primary current and output voltage is compared. Furthermore, the designed generator is successfully used for generating plasma synthetic jet. The effect of the gap distance on the plasma synthetic jet is analyzed. The ratio of dissipation energy at different discharge capacitors is compared. The results show that: The breakdown voltage for different discharge capacitors has a similar value at the same gap distance. The breakdown voltage increases with the gap distance. In addition, large discharge current can be generated when the discharge capacitor is used. The discharge current increases with the value of the discharge capacitor. The ratio of dissipation energy is higher in the case with discharge capacitor than that in the case without discharge capacitor. Under such conditions, it is easy to generate a high-energy plasma synthetic jet.