The Qinghai lake watershed is located in the southeast part of the Qilian mountain in the Tibet plateau. In there, the topography is high，the climate is cold and dry，it is completely encircled by mountains, and the vegetation is good，it always is the fine natural pasture of Qing-hai province. However，since a long period of time，being effected by the disadvantageous .factors of nature and irrational social and economic activities of man一kind，the fragile ecologic environ-ment of the area steadily deteriorated，the wind-sand erosion are aggravated，the water is pollut-ed，the lake level droped，the prairie degenerated，the land becomes sandlized，the productivity is down，and the bird island exist in name only. All these have directly stricted the economic development of Qinghai province. In order to protect and improve the ecologic environment，and to make people rich up，the following measures are needed to be adopted:(1)To harness forest and grassland in the light of national laws;<2) According to the theory of ecological engineering，to plant trees and herb suited to local conditions;(3) To strengthen the management and use prairie rationally，so as to resume the vegetation and to lighten the wind erosion.