Abstract: The significance of large data on the optimization of the side structure of agricultural economy supply was introduced, then using the side structure reform of agricultural supply of Shanxi province as the research object, the present situation of agriculture in Shaanxi province and the existing problems and causes in the side structure reform of agricultural supply were analyzed. The main problems of the side structure reform of agricultural supply in Shaanxi province are the supply-side structure of representative agricultural product, technical structure problem and the structure of adapting to market demand.The approaches of the side structure reform of agricultural supply in Shanxi province were studied, the measures of innovation system, talent cultivation, and big data support were proposed,to promote the reform and optimization of the side structure reform of agricultural supply in China based on the big data.

Key words: big data, the side structure reform of agricultural supply, Shaanxi province