Debris flow acts violently in Panxi where man`s economic action is frequent. It damages the.natural ecology environment, especialy the forest ecological system to exploit the resources during the long history and economy development in the region, for instance, to cut down forest serIously, to destroy forest and reclaim wasteland, to reclaim on steep slope,to explore stone for road construction, to mine and wantonly pour dregs and take biological energy resource excessively, etc,，induce the expansion of the mountain disaster and the debris flow suffering because of the de struction of the natural condition and the forest of hilly land in different extent,The debris flow hits the overall arrangment of the natural economy development and constructon seriously, affecting mine, communication and transportation, hydroelectric construction, urban andrural development,and the production in agriculture, husbandry and so on. Counter-measures to debris flow are to prevent and protect or to control in multiple way,Human should previously protect environment and prevent the occurence of the debris flow when carrying on economic activity.If the debris flow can not be controlled shortly,the arrangment of the economic constructin should keep away from the dangerous deris flow region,i .e,，take preventive measures before it occures. The harness means to,the debris flow should be the following ways, to do the most neccesary control work ahead (engineering measures prior to other)，to combine the biological and engineering measures for harness, and to attach importanceto social preventing and protecting measures.