[Objective] The hazard assessment of debris flow was studied in order to provide an effective method for determining the weights of hazard assessment indexes in debris flow prone area.[Methods] In view of the weakness of single assigning weight method

analytic hierarchy process (AHP) and entropy method were adopted respectively to determine the subjective and objective weights of the debris flow hazard assessment indexes for the China-Pakistan highway

then the comprehensive weights were estimated based on combined weight method. Taking the debris flow along the China-Pakistan highway as a case study

this paper selected ten assessment indexes including magnitude

frequency

length of main groove

basin incision density

basin area

relative difference of elevation

longitudinal slope of main groove

maximum rainfall during 24 hours

thickness of loose deposit

length of mud and sand supply. The method mentioned above was used to assess the hazard of debris flow in this area after the acquisition of field data of debris flow. Besides

the results coincided with the set pair analysis method and field investigation results.[Results] Only five debris flow gullies

accounting for 25% of the total

were moderate dangerous

which meant that most debris flow gullies in this area were high dangerous.[Conclusion] The evaluation results were consistent with the field investigation

which confirmed the reliability of the method.