In order to get the right to speak, the doctor and patient try competing for turns and speech interruption occurs. In view of small corpus, the analysis of conversational interruption between doctor and patient under framework of conversation is made. It makes an analysis of the types of interruption ，pragmatic function and three functions of interruption process( upward，downward，forward) and tries revealing the pragmatic functions and strategies of conversational interruption between doctor and patient in Chinese clinic.