培龙沟是由冰川和降水共同激发的一条大规模泥石流沟。流域内充足的冰水资源，丰富的冰碛，有利的地形条件是泥石流发生及今后发展的动因。1983-1986年培龙沟泥石流堵塞了帕隆藏布江，本文就今后不同泥石流发生频率探讨了泥石流再次堵江的可能性。这一探讨为该沟泥石流工程整治及过沟工程设计提供科学依据。

Peilong gully is situated in the southeastern Tibet and the Sichuan=Tibet Railway along the Peilongzangbu River goes thought its mouth. The debris flows in the gully, often with a large scale, were generally triggered by glacier and rainstorm. In order to research the possibility of the debris flow stopping the river, with the exploration of the whole basin area, visiting the local farmer and getting samples to analyzed its is found that the debris flows of this fully have a trend to be well developed by the large quantity of glacial resource, plenty of tills and other Quaternary sediments, favorable topography. The Peilongzangbu River was once blocked by the debris flows having occurred between the year of 1983 and 1985. According to the debris flows' development tendency and occurring frequency, the possibility in their blocking main river is discussed in details and also the scientific grounds for the engineering project crossing the gully mouth have been given in this paper.