Mountain area i place where mud-rock flow i coexiting with humankind.mud-rock flow act on mountain environment and h2ly affect economic activitie while human economic activitie act on environment a well and intenely affect mud-rock flow.Frequent raintorm can eaily caue violent flood and mud-rock flow in mountainou area. mud-rock flow doe harm to mountain environment and human afety with detroying the earth' urface.
Human' activity hould follow natural law and exploite natural reource moderately in mountain area,otherwie uch activitie will detory mountain environment,increae activity of mud-rock flow and the ituation would be wroe.If our activitie obey natural law, mud-rock flow harm will be controlled and the coordinate development of economy and mountain environment will be poible.