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.