OBJECTIVE：To estab lish the evaluation criteria for repeated usage of TCM decoction pieces and Chinese patent medicine，and to provide reference for prescription comment. METHODS ：By modified Delphi method ，15 experts of TCM were selected，who had plenty of clinical experience. The questionnaire data and expert opinion were collected and summarized to establish related evaluation index system with two rounds of questionnaire survey. RESULTS ：In this two-rounded survey ，experts’ positive coefficients were 100％；authority coefficient were 0.711 and 0.752；reliability of questionaire were 0.830 and 0.926； coordination degree of experts were 0.579（P＜0.01）and 0.721（P＜0.01），respectively. The evaluation criteria for cross-using and repeated usage of TCM decoction pieces and Chinese patent medicine ，which contained 4 first-level items （component repetition，function and indication repetition ，tumor repetition and others ）and 10 second-level items ，were established finally. CONCLUSIONS：Established criteria are with well expert ’s positive coefficient and high authority ，and good reliability of questionnaire. The evaluation criteria for repeated usage of TCM decoction pieces and Chinese patent medicine is formulated preliminarily.