Abstract: On August 7,2010,an extraordinarily serious flash flood and debris flow disaster occurred which caused great loss of life and property.This paper analyzed its causes,and pointed out that the special geological and geomorphic conditions were the potential reasons,high-intensity rainstorm was the inducing one,and irrational human activities,such as reclamation on steep slopes by cutting trees,building hydroelectric stations without rational measures,and living on landslide body etc.strengthened the disaster.Based on the analysis,some countermeasures for Zhouqu County as well as other similar regions were given.Firstly,deepening studies on geological disaster,and reinforcing building of soil and water conservation measures were quietly required.Secondly,returning land for farming to forest and eco-environmental protection should be paid attention to.Thirdly,canonical constructing hydroelectric stations,road,and the infrastructure in city were needed.Fourthly,sound forecasting and prewarning net system were also required.Furthermore,the measures and the consciousness of preventing debris flow should be publicized among the people that are the base to prevent and control mudflow disaster.