Tennis is a type of net-confrontational sport, which requires high physical qualities and high-intensity combat. For tennis players, who are engaged in tennis for certain years, sport injuries are common. In this paper, we surveyed sport injuries of the students majoring in tennis in Physical Education School of Jiangxi Normal University. The aim is to find out the causes to induce sport injuries for these people, and reduce such injuries in the future sport career. The results showed: 76.47% of the students had injuries in shoulder joints, and 52.94%, 44.12%, 38.24%, 6.47% and 20.59% of them had injuries in waists, knee joints, elbow joints, wrist joints and ankle joints, respectively; 35.3% of the students were injured because of inadequate preparatory activities, and 26.5%, 14.7%, 11.8% and 8.8% of them were injured because of incorrect technical movements, poor physical qualities, inappropriate personal equipment, and bad venues, respectively. Therefore, to avoid sport injuries, the students majoring in tennis should do enough preparation movements and then improve their technical movements and physical qualities.