Land is the foundation of real estate economic development，the development of real estate industry is deeply affected by land supply，and the contradiction between its development demand and the shortage of land supply is deepening. Land policy，as a macro-control means to deal with land relations，analyzes the principle of its effect on the real estate market，and makes land policy reasonably，It is of great value to mediate the contradiction between them and promote the healthy and orderly development of real estate industry.