Abstract: The research on debris flow in Nujiang River mostly focused on the influence of tributary debris flow on the main stream, but ignored the tributary debris flow.Dimaluo river is a tributary on the left bank of Nujiang River.It is representative in the upper reaches of Nujiang River(Yunnan)because of its convex slope landform, distribution of metamorphic soft rock, fault shear failure and abundant provenance caused by intermittent uplift of Neotectonic movement.Field investigation shows that debris flow can be divided into three types, gully type, slope type and composite type.Based on the hydrological response unit, 8 evaluation factors are selected.This paper analyzes the susceptibility of different types of debris flow by using AHP and information method.The results show that the areas with high and extremely high susceptibility to all kinds of debris flow are mainly weak strata such as C^d and C^e, and they are mainly distributed along the areas with strong human engineering activities, such as road construction, with the closer to the fault zone, the higher the susceptibility.The AUC of all types of debris flow reaches 83.34%, 90.07% and 84.39%, so the evaluation results are reasonable, which can provide scientific basis for the prevention and control planning and prediction of debris flow in Nujiang River, and provide theoretical and technical reference for disaster prevention and mitigation of mass debris flow in southwest deep canyon metamorphic soft rock area.