Abstract: Abstract：Three debris flow gullies, i.e., Sunjia, Muchang and Yangjuan, are distributed along the mountains behind Luding County seat, Sichuan Province. In the past years, debris flows frequently occurred and serious damaged and threat Luding County seat. In this paper, the distribution of debris flow gullies and some disaster events are described, their formation conditions such as solid materials, landform and rainfall are analyzed, and their occurrence characteristics are discussed in the aspects of time, space and magnitude. On such a basis, the countermeasure system against debris flows is established, and some corresponding prevention advices are put forward.