During the process of building construction, suspension and continuation, or use, when it is necessary to add floors, insert floors, expand, or make large-scale structural system or functional changes for building reconstruction, seismic identification of the original structure is required. The content includes testing the original structure, identifying the original structural system and structure, conducting structural seismic verification according to the reconstructed structure, comprehensively evaluating the seismic performance of the reconstructed structure and the feasibility of the reconstruction plan, and if necessary, proposing optimization measures for the reconstruction plan and suggestions for seismic reinforcement measures for the original structure. The seismic assessment of building reconstruction generally needs to be based on the current seismic design standards.