Using the entropy model and grey correlation analysis and taking Langzhong City,Sichuan Province as an example,this paper analyzes the structure of landuse changes and the response mechanisms in the city.The grey correlation analysis indicates that the information entropy of landuse structure in Langzhong City was stable during the last decade.From 1997 to 2002,landuse structure entropy was closely related to per-land GDP,road density,retail sales of consumer goods,proportion of non-agricultural population,land economy density,ratio of non-agriculture and agriculture,and the correlation degree of above 0.70.The entropy was moderately related to per-capital GDP,with the correlation degree being 0.657 69.However,between 2003 and 2006,landuse structure entropy was moderately related to all the above seven factors,with the correlation degree ranging from 0.35 to 0.70.Further research suggests that socio-economic factors and government action are two main driving forces to the changes in landuse structure.