| This paper explores the roles and effects of multi-ball training on the special quality and energy metabolism of tennis athletes through using the methods of literature investigation, experimental comparison and mathematical statistics. It is an innovation of the tennis training theory to test the authenticity and accuracy of the multi-ball training in practice and will provide a scientific evidence for exercise training instruction and athletic ability enhancement. The results reveal that: (1). The anaerobic energy system is the main one of energy supply systems in various tennis training, such as the speed, strength, agility and other special qualities. Therefore, in order to improve the tennis athletes grades, it's important to focus on strengthening the capacity of anaerobic energy. (2). The multi-ball training can increase training density, intensity and difficulty, and improve athletes'move speed, batting speed and strength. So, in order to improve the athletes'ability of energetic exercise within a short time, it's necessary to use a training method which can combine the rhythm of the move and integrate the technology, the special quality and energy metabolism together. The multi-ball training is exactly the ideal method. (3). From the experimental results, only the athletes'agility and endurance in the control group is significantly improved, while the athletes'speed, agility, power and endurance in the experimental group is improved more significantly and the success ratio performance is better. The result shows that after two months, athletes make significant progress in the special quality and technical level. (4). After the two-month control experiment, the anaerobic, aerobic capacity of the athletes in the experimental group differs from the control group. The experimental group is significantly better. It indicates that the application of the multi-ball training model improves the energy metabolism capacity of tennis athletes.
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