Abstract: The tennis players' body asymmetry is the degree and pattern of tennis mechanical load.Tennis players' upper limb muscles asymmetry is that the dominant arm deltoid, triceps, upper arm flexor as the prominent force, combined with the forearm flexor muscle, small muscle groups with the triad mode to overcome special mechanical load caused by muscle morphology 6%²1% of the asymmetric adaptation process.Upper limb skeletal periosteal expansion mechanism of puberty training to form the main bone microstructure, leading to 11%²5% of the asymmetry of bone morphology, so that bone strength increased 11%⁶6% of the asymmetric osteogenic effect.The main asymmetrical hypertrophy of the trunk muscle group focused on the middle and lower lumbar vertebrae showed a variety of load effects synergistic to overcome the specific mechanical load, resulting in 8-35% of the asymmetric adaptation process;Joint morphological abnormalities, muscle tissue degeneration, strength imbalance occured in the shoulder, abdomen, hip during the process of tennis players' body asymmetry indicates the different degree of injury risk.Appropriate to decrease the load, change the load mode, develop symmetrical muscle strength and priority to form scientific and reasonable specific techniques and so on can be used to block, slow down the asymmetric process to prevent injury or rehabilitation.