GDEM data which is a high-resolution data of DEM used to gully vector data through arcgis software .To set the threshold to extract the debris flow disaster data and checking the correctness of data by superposition existing ge -ological disaster survey data;application of TM images after data preprocessing ,radiometric correction,geometric correc-tion,atmospheric correction ,extraction of vegetation coverage ,NDVI form TM image superimposed extracted debris flow disaster data analysis to study the correlation between the debris flow hazards and vegetation cover and NDVI ,to seek its own rules and reduce the hazards of debris flow hazards .%利用高分辨率GDEM数据，通过arcgis软件提取沟壑矢量数据，设置阈值，提取泥石流灾害数据，通过叠加已有的地质灾害调查数据，进行数据正确性检验；应用TM影像经过数据预处理、辐射校正、几何校正、大气校正，提取植被覆盖度、植被指数数据，叠加已提取的泥石流灾害数据进行分析，研究泥石流灾害与植被覆盖度及植被指数之间的相关性，寻求其规律，降低泥石流灾害危害。
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