Abstract: It is great significance to study the linkage mechanism between land financial components and urban land scale in order to formulate varied land fiscal policies in the process of urbanization in different cities. Based on the view that land fiscal components provide financial support for the expansion of urban land use scale， the interaction mechanism between them is discussed. Systematic clustering is used to partition the data of 31 provinces and cities and the coupling degree of the two systems. The grey correlation between the land fiscal components and the urban land use scale are calculated， whose results show that land finance has not dominated the expansion of urban land use scale in the fast developing regions， but the areas with slow economic development still expect land finance to play a positive role. In view of different regions， some suggestions are put forward to help optimize the relationship between them， improve the carrying capacity of urban land and urge the change of land fiscal policies.

Key words: land finance component, urban land scale, linkage;regional difference