As an accident analysis tool, the simulation system of vehicle collision are developed. On the basis of momentum conservation, speed analysis model for vehicle rear-end collision was established. Then the analysis algorithm was designed. Based on the function structure design, the simulation system for vehicle speed analysis of rear-end collision was finished with Visual C. An actual example was also applied in the system. The simulation result is very closely to actual condition. It indicates that the simulation system is adaptive for analysis of vehicle collision.