基于1985、1995、1997、2000和2004年的遥感影像和GIS技术，引入建设用地密度、扩展强度指数和分形维数，对1985—2004年间沈阳市市区和农村建设用地扩展的时空特征、空间分异和形态变化进行分析，并探讨了其主要驱动因素.结果表明：1985—2004年间，沈阳市市区建设用地的高密度区面积逐年增加；1997年以前，农村建设用地各级密度区面积的变化不大，1997年以后其高密度区面积逐渐增加；研究期间，市区建设用地的增加面积、扩展速度和扩展强度明显大于农村地区.市区和农村建设用地扩展的空间分异明显，高速扩展区主要集中在市区.市区建设用地分形维数值逐渐增大，总体形态日趋复杂，农村建设用地由于缺乏合理的规划建设，分形维数波动较大.经济发展、人口增长、交通、自然环境、政策导向和城市规划是沈阳市建设用地扩展的主要驱动力.
By using 1985, 1995, 1997, 2000 and 2004 satellite images and GIS technology, three indices including built-up area density, expansion intensity inde
x, and fractal dimension were chosen to analyze the spatiotemporal characteristics, spatial differentiation, and morphological changes of urban and rural built-up areas in Shenyang City in 1985-2004, with the main driving factors discussed. In the study period, the high-density area of urban built
-up area in the City increased year by year, and that of rural built-up area changed slightly before 1997 but increased gradually thereafter. The increased area, expansion speed, and expansion intensity of built-up area were evidently greater in urban than in rural area. An obvious spatial differentiation was observed in the expansion of built-up area between urban and rural areas, with the high-speed expansion mainly concentrated in urban area. The fractal dimension in urban area increased gradually, which meant that the integrated configuration of urban area became more and more complex, while that in rural area changed irregularly, because of the lack of reasonable planning and construction. Economic development, population growth, transportation, natural environment, policy-guiding, and urban planning were the main driving forces of the expansion of built-up
areas in Shenyang City.