Changes in landuse, especially construction land of Xianyang City during the years from 1999 to 2006 are analyzed. Urban land, rur al residential land, and highway land in Xianyang City have undergone relatively significant change in various types of construction land. Based on national economic development data of Xianyang City during the research period, some indicators are selected, such as gross domestic product, output values of secondary and tertiary industries, total investment in fixed assets, fiscal revenue, fiscal spending, retail sales of consumer goods, and total population. SPSS software is used for these indicators by the method of principal component analysis and the driving forces of construction land changes of the city are determined. T hrough the analysis of construction land, driving forces of construction land changes of the city are found to be policy factor, economic factor, the level of urbanization, and arable land factor. Finally detail analysis is made on the impacts of various factors and comments and suggestions are given for the construction land development of Xianyang City.