Chinese commercialized insurance began to explore the participation in social medical insurance service at the beginning of the 21st century, the practice in all parts of China has formed “trust-management model”, “insurance-contract model” and “mutual insurance model” and so on in the social medical insurance joined by commercialized insurance, but each model has its feature and advantage and its defect and shortcomings． Future direction of “the cooperation between government and insurance company” should be“double-integrated-trust-management model”, i.e., breaking the dual structure of urban and rural areas to set up the urban and rural integrated medical insurance system, commercialized insurance participates in the basic medical insurance of urban and rural residents by “trust-management model”, participates in serious disease insurance for urban and rural residents by “insurance-contract model”, and implements the integrated management of ”basic medical insurance + medical insurance for serious diseases”.