[Objective] To acquire the characteristics of debris flow in alpine mountain in order to analyze the mechanism and the harm degree. [Methods] Based on the field investigation

the "three high" distribution of debris flow (cold

high-altitude

high-intensity) along Sino-Pakistan highway

the inducing mechanism were researched. [Results] At this area

tectonic movement was active

rock mass structure was broken

joint fracture was developed

besides located in the alpine mountains

and affected by climate and the rock thaw to spall

thus created conditions for the outbreak of the debris flows. In addition

because of the unique structural characteristics of Tianshan Mountain

there were several hundred meters thick of sand and gravel layer to ensure the replenishment rate. High and steep terrain provided sufficient movement potential. Thereby concentrating rainfall and snowmelt role were the direct causes of the outbreak of debris flow. Erosion

collapse blocked and outburst came into being debris flow. [Conclusion] The debris flow in alpine mountain was mainly affected by climate

terrain

hydraulic power and geological conditions. With the greater difference from rainfall debris flow

it has obvious plateau characteristics

reflected in the source material

water and terrain conditions.