Using the principle of geo-chemistry study the present state of water and soil loss on the upper reaches of Wanshui River in Dabieshan Mountains in Yuexi County in western Anhui Province. Rate of soil formation is less than the rate of soil loss,the river water not only transpots quarte but als carrie orthoclase and chemical weathering solid residual of Quarternary. The study area is a serous soil and water loss place