Abstract: Based on remote sensing interpretation and field investigation, there are 329 debris flows developed in the Wudu section of Bailong River Basin. According to the three major disaster-pregnancy conditions of topography, material conditions and external excitation factors, 9 disaster-pregnancy factors such as elevation, slope, and lithology were selected. Based on ArcGIS platform, the distribution law of debris flow in the research area was analyzed and the debris flow risk was assessed by using information model. The analysis result showed that: ① Debris flows in the study area were mainly distributed in the elevation range of 1800~3000m and NDVI value of 0.2~0.4 in terms of topography, and their dominant slope distribution range were 15°~35°. ② In terms of material conditions, a large number of debris flows we re developed in the range of the peak acceleration of ground motion of 0.2g, and mainly distributed in the soft-hard and medium-thick layer -thick layer slate and clastic rock formations mainly composed of phyllite and slate, while the areas of debris flow were negatively correlated with the distance from the the faults. ③ External excitation factors were mainly distributed in the area with the maximum rainfall of 36~40 mm per hour. And it was negatively correlated with the distance from the rivers and roads. ④ The risk assessment on debris flow was done by information method and the risk zoning map was obtained. Results showed that the debris flow area in the medium, high and extremely high risk range accounted for 21.77%, 32.94% and 31.49% of the total debris flow area, and the high-level danger zone was mainly distributed on the north bank of Bailong River. The ROC curve was used to verify the evaluation result, and AUC was 0.737, which means the evaluation result is accurate and reliable.