Tennis requires a high level of physical fitness. Once physical fitness fails to keep up, its reaction ability and movement speed will decline, and ultimately affect professional development. Therefore, when arranging tennis ball fitness training, we should improve our understanding of the concept of physical fitness training, grasp every sensitive period of teenagers' physical quality development, develop their ability in an all-round way, and also understand the psychological characteristics of athletes Then combined with the characteristics of modern tennis and the constituent elements of the special physical fitness of young tennis players, that is, moving speed, fast strength, coordination, sensitivity, aerobic endurance and anaerobic endurance, this paper preliminarily discusses the special physical fitness training methods of young tennis players, with a view to providing some help for the physical fitness training of young tennis players.