Abstract:From the perspective of public policy, the policies of science and technology correspondent system can be divided into four stages: gradual popularization stage, demonstration and extension stage, in-depth promotion stage, and new development stage. The results show that macro and micro dynamic forces and their interaction are the fundamental reasons to promote the institutional change of science and technology correspondent, and the final purpose is to produce a causal relationship chain for increasing farmers' income from the interest community of science and technology correspondents, farmers, and industrialization organizations and so on. That is all for rural revitalization in China. The science and technology correspondent system has evolved from a science and technology policy focusing on technology promotion to a comprehensive institutional arrangement focusing on the effective docking of technology and market. Building a professional science and technology service platform which can integrate the two types of resources of science and technology correspondents and industrialization organizations will be the future of science and technology correspondent system.