To research the reasons why the existed measures of soil and water conservation bring the different benefit of soil and water conservation which are existing in the same valley and at the same time. We cite the data of Gushanchuan valley and introduce the existed effect

at the same time

we use the method of analysis and compare

in the end

we think the evident different effect is theresult of taking different number of measure and different keeping water and reducing sand index.To resolve the existing difference and enhance the accuracy

we will strengthen the research work of basic data and disciplinarian

especially for the research work in the small runoff watershed and the disciplinarian of soil erosion in small watershed and the benefit of soil and water conservation etc.