Debris flows in Xian region are distributed mainly on the north slopes of Qinling Mountains, Lishan Mountain, and the high一edged slope areas of the loess tableland. They endanger local factories, schools, cities and towns,residential quarters, roads，farmland，etc,，seriously. The urgent matter facing of departments concerned of Xian city should be to investigate debris flows extentively, to plant trees and grasses widely, and to attach great importance to the construction of key projects for the prevention and control of debis flows