By means of extensive investigation and researches and on the basis of fully understanding the natrual,ecological,social and economical status in the origin area of the Yellow River,we launched works on prevention,protection and supervision for soil and water conservation and the project of ecological restoration.Three years after this project was started,we achieved notable successes in the following aspects: dissemination of the regulations concerning soil and water conservation,construction of the guarding and monitoring system,construction of demonstration area of ecological restoration and construction of supervision on the soil and water conservation network system.Ecological environment had been greatly improved,and the man-induced loss of soil and water had been effectively controlled within reasonable limits.