Integration of three industries is an important way to achieve structural reform of the supply side of agriculture. The key to the development of agricultural three-industry integration is the supply of land. Starting from this point, the land consolidation, increase and decrease linkage, industrial and mining wasteland reclamation and rural stock construction land that provide land use security for three-industry integration, as well as industrial policies, guarantee mechanism and other special provisions for the development of three-industry integration are reviewed in this paper.