With the research methods such as the documentary data, questionnaire, interview, mathematical statistics, teaching experiment to make an analysis of Multimedia CAI Courseware based on network. Taking the network multimedia tennis teaching system as the basis, this paper will provide some suggestions and references for the application of network multimedia system in other sports teaching courses and explore the development of network multimedia teaching system in the future. This paper carries on the theory and method research of network multimedia CAI tennis teaching system, and also carries on the evaluation and practical application of this system. Taking the Jinggangshan university tennis elective course's students as the empirical object, comparing the computer network teaching model with the tradition teaching model, this paper will analyze the feasibility and effectiveness of network multimedia CAI tennis teaching system and explore its application way, thus achieve the combination of theoretical teaching and technique practice and promote the effective integration of teacher and students and teaching quality.With the rapid development of network and computer technology, our society and each profession have launched the computer information revolution. Under this technical influence the professions such as education, medical and government have built their own information network platform. Among the numerous courses, because of the unique point of physical education, the sports network teaching must have its own characteristics and requirements. Because the network multimedia teaching system has a powerful interactive feature, it can create mobile communication platform, greatly increase the exchange time between teachers and students and contribute to the FAQ of the knowledge. Although the network multimedia teaching system has the incomparable superiority, in our country's sports education circle, the related tennis teaching network multimedia is also rare [1]. How to let this superiority fully develops in the tennis teaching becomes an urgent problem. Through the teaching quality and students’ study efficiency, thus enhance the tennis technique teaching