Abstract: Change detection has been widely applied in various fields.The fast and effective monitoring of change is involved in disaster dynamic monitoring,pollution monitoring and urban planning,etc.Terrestrial laser scanning is employed to detect the change of building models,taking the advantage of high speed,good precision,real-time,able to work around the clock,etc.The method consists of three steps: automatic point cloud registration;building change detection using optimized hausdorff distance algorithm from different model laser scan epochs;by plane fitting and Delaunay triangulation constructing,the change of regions of interest is quantified to assess the extent of the damage of disasters on the building,which provides a reliable basis for decision making in emergency response,insurance claim evaluation,etc.