Abstract: Most districts of Panzhihua are high danger areas of debris flow. Those counties dominated by Panzhihua were formerly endangered by debris flow. Till now, many towns, mine areas, power plants and traffic establishment are threatened by debris flow. The debris flow gullies in this area are distributed in zones of Annin, Jingsha and Yalong rivers, which have the characteristics of developed fault, strong rock weathering and frequent rainstorms. Based on the statistics of development conditions of about 200 debris flow gullies, The authors found that the gully ratio of slop, drainage area, main gully length, gully form factor and the relative altitude have the nonlinear properties on the spatial distribution, which also have a good nonlinear correlation with corresponding debris flow gullies. It is shown that the evolvement of debris flow has selfsimilarity. Among these factors given above, the values of the gully ratio of slops and the drainage area are the least. This illuminates that the gully ratio of slops and the drainage area could control the form and progress of debris flow. These phenomena also reveal the nonuniformity and selfsimilarity of debris flow gullies development on certain degree.

Key words: Panzhihua, debris flow, nonlinear