Abstract: The traditional way of monitoring structural deformation is mounting deformation monitoring device in some of the characteristics of structural parts, in order to achieve the purpose of deformation detection, but the way to a certain extent, can’t fully reflect the deformation of structure. Due to the shortage of traditional methods can’t effectively monitor the initial shape, structure deformation, maximum deformation, accurate scanning full range of structure complete modular in trestle bridge by different levels of loads using Trimble TX8 3D scanner Tianbao, quickly and efficiently obtain the point cloud data with high precision, high density, through the integration of the point cloud data processing and analysis can get timely comprehensive information of trestle bridge structure deformation, provides sufficient data for deformation analysis of mechanical properties of structure.