Under the support of RS and GIS technology, with TM image of 1987, 1999 and 2008 as main data source, the spatial characteristics and dynamics of land use in Sanya City were studied. The principle component analysis was carried out on social and economic factors with SPSS software, the regression analysis was conducted on land use variation, the driving mechanism was discussed. As indicated by the results, the land-use change characteristic of Sanya from 1987 to 2008 is farmland reduced quickly and non-farmland was on the contrary. The primary land-use driving factors were socio-economic factors, tourism development and agriculture production factors. The more non-farm population and fixed investment were the larger of constructive land. Forest land was closely associated with total people and agricultural machinery. Lying on the geographical advantages, the tourism developed rapidly, ecological construction input increased in Sanya City as well as garden plot area.%在RS与GIS技术支持下,以三亚市1987、1999、2008年TM影像为主要数据源,研究了三亚市土地利用空间格局特征及其动态变化,利用SPSS软件对社会经济因素进行主成份分析,并对土地利用变化进行逐步回归分析,探讨三亚市土地利用驱动变化机制.结果表明:1987～ 2008年三亚市土地利用变化的基本特点是农业用地面积大幅度下降,非农用地面积快速增加；影响土地利用类型结构变动的主导驱动因子是经济社会综合因素、旅游业发展和农业生产因素；固定资产投资和非农业人口的剧增使三亚市城镇化面积增大,建设用地面积增加,人口和农机总动力变化直接导致林地和耕地的持续减少；依托自然地理优势,三亚市旅游发展迅速,生态建设投入增加,园地面积直线上升.
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