To ensure the active application of seismic construction technology of long-span space steel structure hangars in urban construction and planning, it is necessary to study the seismic technology of these hangars. This paper proposes a seismic construction method for such hangers based on building information modeling (BIM) technology. This method introduces composition, seismic construction requirements, construction basis, and the construction procedure of long-span space steel structure hangars, and describes the specific application of BIM technology in seismic construction of these structures, including construction process and construction principle. A simulation engineering example analysis proved that after seismic construction using BIM technology, the bearing capacity and lateral stiffness of long-span space steel structure hangars were clearly improved, and the structure bore most of the seismic internal forces of the building structure in the early stage of an earthquake.