Framing camera based on gated Micro-channel plate(MCP)was widely used in inertial confinement fusion(ICF)and Z-pinch because of its ultrafast time-resolve.Electrons with imaging information are multiplied when the HV pulse propagating through the MCP strip line.Obviously,the HV pulse was used as a shutter here,then the exposure time of the imagine will be determined by the width of the pulse.Theoretical analysis indicates that the gating pulse(200ps)has a bandwidth of 5GHz,thus,impedance match in the propagating path of the pulse will be very important.Impedance mismatch will cause reflecting of the pulse and decrease the transmission efficiency.This will cause un-uniformity of the dynamic gain of the MCP,and finally resulting in image distortion.A new designed impedance matching circuit is developed in this paper.Simulated results showed that the new designed impedance matching circuit could reduce the reflection of the gating pulse significantly,and dynamic gain uniformity of the MCP was increased simultaneously.