Abstract: According to the principle of Cherenkov radiation (CR), the direction of CR light is strictly defined by the direction along which the charged particle moves. This angular orientation between particle and CR light can be utilized to measure and calculate beam divergence and its distribution. With multi Coulomb scatter and ionization with target material taken into account, this paper analyzed the Cherenkov effect and its application, created the simulating model with Mont-Carlo method, developed the computing code, and simulated the process of Cherenkov effects and inverse. The simulated result shows that the electron beam divergence and its distribution can be measured based on CR with an appropriate target. Simulation work put forward the appropriate conditions for the following measuring experiments and made a good reference for future work.