The emergence of the medical group is a signal，which represents the doctors’ transition from the passive flow to the active flow. The influence of the medical groups will be significantly enhanced in the medical reform since their organizational structure are increasingly perfected，which indicates the coming of the inflection point of of structural changes in medical systems. At the same time，the government’s guidance and market screening will enable the influential medical groups to develop，and eventually become one of the main components in the medical ecosystem.