Abstract: The sprint level between domestic and foreign athletes demonstrates a big difference, the reason of which is varied. According to the analysis, the main factor restricting Chinese athletes’ performance is energy and its distribution in various segments of the body. Unlike middle-distance, we must rely on precise split-time technology to comprehend the speed - energy variations. Each stage of the sprint process is a part of the whole, each part is mutual restraint of others and every part has its best record. The simple pursuit of the optimal state will not help the final phase, but the result may be counterproductive.

Key words: precise split-time, high level sprint training, speed-energy variation