The etiologic factors of tennis elbow have been obscure in spite of increased concern and study. The true pathologic changes in tennis elbow are also not well established. The authors anslized 300 tennis players for a history of tennis elbow, finger size, body weight,weight and grip size of racket etc. The results were as follows; 1. 68 among 300 players have suffered from tennis elbow more than one time (22.7%). 2. There were no difference in correlation between body weight and racket weight. 3. Most players have used improper grip, especially in those who have suffered from tennis elbow.