Tennis is very popular, but the incorrect action produces sports injuries. The knowledge of sports biomechanics is used in sports injury research on tennis. Two mainly classical research methods on tennis sports biomechanics are theoretical research and experimental study. This paper introduces the technical features of two research methods, theoretical research is mainly based on the model. The experimental study is mainly based on three systems of the kinematics, dynamics and biological measurement. The differences among them are compared in order to provide the overall ideas for study on sports injury of tennis.