To improve the performance of the femtosecond streak camera, a novel accelerating structure is designed and applied to streak camera with accelerating mesh and slit channel, parallel plate electrodes. Considering X-ray incident on CsI photocathode in actual inertial confinement fusion(ICF) experiment, large photoelectron energy dispersion and the space charge effect, 2000 photoelectrons’energy and angular are sampled with Monte Carlo simulation, their trajectories are calculated with the fourth-order Runge Kutta method. Time and space resolution of streak camera with this novel accelerating structure are obtained by analyzing electron time and space distribution on the imaging surface, and the result shows that time resolution is up to 508.4fs and space resolution is up to 21l lp/mm. Compared to the traditional parallel plate electrode streak camera, the time and space resolution are significantly improved by 90% and 29% respectively. The novel accelerating structure of the streak camera is simple and practical.