Abstract: On the basis of summarizing the main characteristics of gully debris flow in southern Anhui, the investigation elements and evaluation factors in the process of the investigation and evaluation of gully debris flow in this area were reorganized, and the work method of the investigating and evaluation of gully debris flow was proposed. That is, a preliminary evaluation of debris flow in the valley is carried out in advance, and the preliminary evaluation standard is established based on the ratio coefficient of transportable provenance capacity and siltation capacity. The main investigation contents are the morphological characteristics of catchment basin, the transportable source property distribution and reserve features of transportable provenance, and the topography of accumulation area of gully debris flow, which were taken as susceptibility evaluation factors and scores, were assigned to evaluate the susceptibility of gully debris flow. Taking Xiaorong debris flow as an example, this paper introduces the practical application of debris flow investigation and evaluation methods, in order to show a more intuitive, more scientific and more practical method for investigating and evaluating gully debris flow in southern Anhui.