In recent years,China is actively implementing the policy of urbanization.The rate of urbanization is increasing and the problem of grain security has been increasingly concerned.By the co-integration analysis in this paper,we find that there is a long-ternl equilibrium relationship between the rate of urbanization and the output of grain in China.The result shows although the process of urbanization in China may occupy agricultural land and cause the phenomenon of ＂non-agricultural＂ and ＂non-food＂, the efficiency of rural land use is impro...
