The family farm has the dual nature of service demand and supply of agricultural science and technology.Agricultural science and technology service model based on family farm has been very mature in developed countries,such as the trinity service model led by government in the United States,the multi-participation service model led by non-governmental organizations in France,the government and the rural cooperative dual track and drive service mode in Japan.Its strong government support,sound organization system,developed farmer organization and other model construction and the experience of p...