Abstract: In view of the research progress on current rock mass movement，the advantages and disadvantages of 7 predictions of the surface movement distortion is discussedCombining with some cases of coal mining project，FLAC^3D numerical analysis method is used to forecast the surface movement rules and the distortion tendencyAnd its data are processed with the excel tableHence，its trend，the typical curve of dip section and the expression of rock mass migration parameter are determined，thus providing a reference for the prediction of the surface migration and the distortion in the actual project

Key words: Surface movement, Numerical analysis, Similarity Principle, Fitted curve