中文摘要：

以三江源区为试验区,利用1998—2010年热带降雨卫星（tropical rainfall measuring mission,TRMM）和气象站点数据,进行标准化降水指数（SPI）的分析与计算,获得了三江源区8月份10 a干旱变化的时间序列信息,并分析了区域干旱时空变化规律。结果表明：基于TRMM数据的标准化降水指数进行干旱监测精度较好,充分发挥了站点和遥感方法的优势,具有实际应用价值。

英文摘要：

Drought is one of the most common natural disasters.Researches on the change pattern of extent and severity of drought have a positive significance to the studies on drought prevention and ecological change.The study area for this research is the ＂Three-river Headwaters＂ region in China.Tropical Rainfall Measuring Mission（TRMM） remote sensing data during the period from the year 1998 to 2010 and meteorological rain-gauge data were used to calculate and analyze the values of standardized precipitation index（SPI） for the study area.The time series of 10-year drought conditions and the spatiotemporal change of drought were analyzed.High accuracy was achieved by integrating the TRMM data with SPI,which was demonstrated that this method was of practical significance for the study area.