OBJECTIVE：To provide referen ce for improving commission management system of medical insurance in China. METHODS：By analyzing the problems of commission management system of medical insurance in China ，studying the specific types，responsibility division and its features of basic medical insurance contractors in the United States ，the suggestions were put forward for improving corresponding system in China. RESULTS & CONCLUSIONS ：There are some problems in the entrusted management of medical insurance in China ，including that the fair competition mechanism has not been established ；the operation and management of social security fund lacks of supervision mechanism ；the role of the government is unclear and inexperienced ； the imperfect supervision mechanism causes follow-up problems ；it is still uncertain whether the entrusted management system can improve the efficency of medical insurance management. In the United States ，the way of entrusted management of medical insurance was to introduce the third-party management. The contractors employed by the Centers for Medicare and Medicaid Services in the United States mainly included medical insurance contractor ，zone program integrity contractor ，comprehensive error rate test review contractor and statistical contractor ，supplemental medical review contractor ，qualified independent contractor and so on ，among which medical insurance contractor was in the core position. Each contractor had a clear division of labor in handling medical claims ，preventing medical fraud ，reviewing the correctness of payments ，evaluating medical records and handling appeals. This mode greatly reduced the work pressure of the government ，improved the efficiency of medical insurance management and operation，and promoted the continuous improvement of the whole system. It is suggested that China should expand the scope of social agency management ，clarify the responsibilities of government and social resources ，introduce various types of social economic organizations and establish a complete and effective performance supervision and management system in order to improve the modernization level of China ’s medical insurance governance.