Research On Technical Efficiency Of Soybean's Planting Pattern In Sichuan Province

China was the largest soybean-producing country in the world before 1950s,90% of the soybeans were supplied by China in the international market. Since 1996, China began to be a soybean-imported country from a soybean-exported country, there is a serious shortage in domestic, the contradiction of demand and supply is very prominent. That's because the acreage of soybean is low and inefficient, which seriously affect the enthusiasm of farmers to plant soybeans. From the perspective of domestic, the northeast and north China are the main soybean-producing areas, accounting 2/3. But the planting acreage of soybeans has become saturated, the development of soybean industry should tend to south areas, where the population is big, the land is little, and the food production pressure is huge, but it has suitable soil and climate conditions to plant soybeans. In 2006, the experts fron Sichuan Agricultural University innovated the planting model of "wheat-maize-soyean", in placed of the traditional model "wheat-maize-sweet potato", it not only reduced the labor-intense, expanded the planting acreage, but also increased soybean production and farmers'income, which are meaningful to stable and develop domestic soybean production, meet the demand for soybeans and maintain a regular market.To further study the technical efficieny and its influencing factors, the paper is based on the agricultural sustainable development theory, agricultural technology innovation theory, technology diffusion and transformation theory and three-dimensional theory, and qualitative and quantitative research studies were adopted, the paper analyzed the technical and economic efficiency and influencing factors of diffusing the "wheat-maize-soybean" model, combined with 237 "wheat-maize-soybean" cropping pattern and 114 "wheat-maize-sweet potato" cropping pattern farmers. Firstly, input and output of the two models are comparatively analyzed using descriptive statistics; Secondly, the technical efficiency of soybean is calculated with the Cobb-Douglas production function; Thirdly, DEA efficiency of the two models are evaluated using non-parametric estimation model; Finally, from the perspective of farmers, the technology promotion factors model of "wheat-maize-soybean" cropping pattern is established, the technical efficiency of soybean is explanatory variables, Tobit regression model is used to reveal the roles of influencing factors. Conclusions can be drawn as follows:(1)The soybean industry in Sichuan develops slowly, the level of yields is much lower than the national average level. The reason that local government is indifference with soybean industry seriously affected the farmers' enthusiasm, the planting areas of soybean in Sichuan tend to decline year by year. (2)Soybean production efficiency in Sichuan is low, it's only 0.74. The low technical efficiency directly restricts the growth of soybean production. (3)There are some problems in "wheat-maize-sweet potato" cropping pattern, such as waste of resources, unreasonable input and so on. "wheat-maize-soybean" cropping pattern is DEA efficient. (4)Different factors have different roles on the "wheat-maize-soybean" cropping patterns. The significant influencing factors are material input costs, policy support and technical services, the impact of other variables are not significant.In summary, on the basis of comprehensive analysis above, some relevant policy recommendations are drawn from the angles of government, enterprises, research institutions and farmers. Firstly, the support and subsidies should be strengthened the least purchase price should be made to solve the production and marketing problems. Secondly, the role of enterprises should be hignlighted. Develop the contract agriculture to promote the development of soybean industry. Thirdly, strengthen exchanges and cooperation with research institutions, support experts with soybean seed technology research, organize experts to conduct technical training and guide in the field. Finally, encourage farmers to participate in the technology extension, training radio, magazines, television and other medias relied on agricultural colleges and agricultural institutions, so ao to spread the new technology in rural areas quickly and more widely among farmers.