The circuit that a high-voltage pulse is sharpened by an opening switch and a closing switch is designed. The electric exploding wire switch (EEOS) is adopted as the opening switch to steepen pulse primarily. When the EEOS explodes, the voltage passes through the gas switch which is used as the closing switch， and then is sharpened to high-voltage pulse on the terminal load. This high-voltage and high-current circuit is simulated by steps with the software PSPICE. The experimental results show that the rising time of the pulse steepened twice is nearly 1ns, and the peak voltage is greater than 200kV on condition that the preliminary voltage is 35kV. The results obtained from the simulation and the experiment are identical on the whole. As a result, this circuit has great prospects in the pulse mediation system.