Abstract: With ever increasing of population as well as acceleration of industrialization and urbanization, the scarcity of land resources and ecoenvironmental degradation resulted from unreasonable use of land have become more and more obvious.Since early 1990s, it has been recognized by almost all the countries in the world that land resources have to be used in a sustainable way in order to realize the global sustainable development. An unbalanced trend between the fast increase of population and massive decrease of cultivated land is being become more and more prominent. The reasonable and effective use of land resources is closely related to sustainable development of human society, food supply forever increasing population and maintenance of environmental quality favorable to human being. Therefore, study on optimal allocation of land resources and , then, probing into the ways of its sustainable use is significant both theoretically and practically.