In view of the deficiency of traditional teaching methods and teaching resources in clinical practice， our department has designed cases according to diagnosis， diagnosis basis， laboratory examination and treatment， and deploys the case based learning with PPT files according to such teaching process as case introduction， guiding discussion， summary and teaching， introspection and expansion as well as homework. Meanwhile contrast experiment was carried out. The results have showed the case based learning probably has the positive impact on improving teaching quality of clinical practice， mainly reflected in： ①contributing to the completion of the teaching outline； ②contributing to the transform of theoretical knowledge from systemic structure to applied structure； ③contributing to establishing the teaching model and assessment system which are more complete and standard than the traditional teaching methods； ④contributing to improving students' interest and mo-tivation； ⑤contributing to improving the teaching efficiency， which makes students have more time to participate in the application and training of clinical skills.