Parameters optimization design of high-speed moving object is a very complex question. It involves many other subjects both in theoretical research and engineering application. Therefore, it is very significant to research on motion parameter optimization design of high-speed moving object. Firstly, in the known initial moment, the entering depth of moving object is; the initial velocity is; the length of moving object is L; the angle into the water is; and the average relative density of object is. It researches on the optimization of the best slenderness ratio, cavitation number and cavitator radius of high-speed objects. And then it specifically deduces the best motion displacement under the known initial momentum. Finally, it takes computer simulation and imitation to all optimized parameters and gives specific numerical examples by applying MATLAB, which provides theoretical basis for actual experiments.