This article introduces fundamentals of Three-dimensional Laser Scanning(TLS)technology, categorizing and selecting of three-dimensional laser scanner and workflow of TLS system.According to actual project condition, accuracy, sites and targets of scanning are determined.Merge and de-noising of point-clouds data are completed using software CYCLONe and GEOMAGIC.3D model of the palisades meeting requirements of engineering accuracy is established to provide exact geological data for design of foundation and slope protection.Device selection, parameter selection and method of post-processing in this article can provide references for other similar accurate geological survey of palisades.