Taking environmental capacity of rainfall resources of trees as a basis and through spatial regulation of precipitation, the technology of runoff regulation afforestation improves local water supply environment of soil of trees and promotes growing of trees.

The Jiuhuagou watershed, located in the arid and semi arid mountainous region of Dingxi County in Gansu Province, has established a completed system for runoff regulation and control, from the upper stream to the downstream and from slopes to gullies.

It is an effective way to achieve synchronous soil erosion control and rainwater resources by means of slope runoff adjustment measures to eliminate soil erosion.

Some tests have been done to simulate manual rainfall runoff washout on slope compound,and to study on runoff adjustment effect under the condition of 2 kinds of rainwater intensity and 4 pieces of measures,to analysis runoff principal from runoff time,erosion and sediment amount.