OBJECTIVE：To conduct the prescri ption comment of Chinese patent medicine based on self-developed rational drug use system and evaluate its effect ，and to promote rational use of Chinese patent medicine. METHODS ：The self-developed rational drug use system was used to evaluate the complete prescriptions and classified special prescriptions of Chinese patent medicines in our hospital from Jan. to Jun. 2019（before implementation ）and from Jan. to Jun. 2020（after implementation ）； combined with pharmacists ’manual comments ，the situation of irrational drug use in the two periods was compared ，and the effect of prescription comment by rational drug use system was evaluated. RESULTS ：Results of full prescription comment of Chinese patent medicine in our hospital showed that the unqualified rate of Chinese patent medicine prescriptions was 1.5％，which was significantly lower than 5.6％ before the implementation （P＜0.05）. Results of special prescription comment of Chinese patent medicine showed that the unqualified rates of TCM injection ，toxic Chinese patent medicines and emergency Chinese patent medicines were 11.8％，10.7％，11.0％ before implementation ；while after implementation ，they were 3.6％，4.2％ and 6.6％， which were significantly lower than before implementation （P＜0.05）. CONCLUSIONS ：Self-developed rational drug use system of Chinese patent medicine shows remarkable effect on full prescription comment and special comment ，which greatly improves the level of rational drug use of Chinese patent medicines in our hospital.