Abstract: Debris flow disasters are sudden, rapid and serious, easy to cause serious losses to people??s lives, property and social infrastructure construction. Taking the rainfall data when mudslide occurred in Jishishan county from August 2 to 3, 2018 as the critical value, combined with the data of environmental variables such as terrain and geomorphology, soil quality, vegetation coverage and hydrology in the region, it is found that the areas such as Liuji township, Shiyuan township and Dahejia township of Jishishan county are prone to high risk areas of debris flow disasters through data analysis with GIS technology. There are three main causes of local mudslides. ①The local vegetation is seriously damaged so that the soil is unstable and heavy rainfall easily causes debris flow. ②The research area belongs to the Loess Plateau landform, and debris flow is easy to occur under the erosion of water. ③ The damage along the Yellow River is more serious. In the flood season of summer and autumn, the water volume of the Yellow River increases sharply, and the soil without vegetation protection is severely eroded, providing material conditions for the occurrence of debris flow.

Key words: Jishishan county, debris flow, GIS technology, spatial distribution, overlay analysis