Based on geographical information system technology, DEM of the area and CSLE model and according to the basic principles and methods of environment economics, the value losses of soil erosion of Meng Mountain was analyzed and estimated. The results showed that the total economic loss of water and soil loss was more than 12921.548yuan in 2004. And the direct economic loss value was 1776.387yuan. It was 5.001% of the first industry GDP of the year and the paper concluded that the economic loss of soil erosion in study area was 344.221 yuan/km2 in 2004. The losse of nutrient and organic matter was 1639.11yuan and it was 92.31% of total direct economic loss of soil erosion and their loss proportion was greatest one in these valuated factors. Secondly for the soil water losses and it was 2.83% of total direct economic losses of soil erosion. Among different land use types, the economic value losses of soil erosion in forestland and sloping farmland were the most serious in the study area, they were 86.813yuan and 483.184yuan, accounting for 48.91% and 27.20% of total direct economic loss of soil erosion, respectively. It made clear that forestland and sloping farmland were the keys of harnessing soil erosion. Then this paper discussed the assessment model of economy loss and eco-value loss of soil and water loss. The calculating model was built, and the ratio of eco-economy area marginal loss on soil and water loss were analyzed. The results indicated that the direct economic marginal loss increased 10000yuan, based on the foundation, the eco-economy marginal loss would increased 7691yuan among five land use types