中文摘要：

以小江流域蒋家沟、大白泥沟为研究区，利用1987～2014年陆地卫星影像数据，采用面向对象自动解译和人工目视解译相结合的方法，生成两条泥石流沟不同时期堆积扇危害范围数据集产品；结合地形资料，分析不同发育期泥石流堆积扇危害范围变化情况及其影响因素。分析表明：（1）1987～2014年，蒋家沟、大白泥沟泥石流堆积扇危害面积出现退缩趋势。（2）处于壮年期的大白泥沟流域堆积扇退缩幅度小，处于老年期的蒋家沟泥石流堆积扇退缩幅度大，且已趋于稳定。（3）水源、物源和人类活动是蒋家沟、大白泥沟堆积扇危害范围变化的主要影响因素。

英文摘要：

Based on the Landsat images during 1987 to 2014, this paper interpreted the hazard areas of debris flow fans, analyzed their evolution characteristics in the Jiangjia and Dabaini catchments in Xiaojiang Basin, and further discussed the variation of influenced area in Jiangjia and Dabaini catchments, as well as their influential factors of the variation. It revealed that （1） the damaging ranges of debris flow fans have shrunk during the recent 30 years; （2） the development of debris flow fans in Dabaini basin was at the mature stage with lower amplitude of shrinkage, while in Jiangjiagou basin, their development were at the over-mature stage with higher amplitude of shrinkage and stable situation; （3）water, sediment provenance and human activities are the main factors of that influence variation of debris flow fans.