Through the analysis of soil erosion factors,a comprehensive evaluation model for grade division ofsoil erosion based on the technique for order preference by similarity to ideal solution（TOPSIS）was established by selecting vegetation coverage,surface slope,area ratio of valley to slope,gully density,and arearatio of collapse to slope as evaluation indexes.The grade division of soil erosion was then made according tothe evaluation.An empirical study was conducted by taking the development and construction projects ofpower transmission for an example.Results show that the TORSIS model is simple and convenient,and theresult is reasonable.It provides a basis for the relevant departments to develop soil and water conservationplanning and its control measures.