Taking the calculation formula of the finite element equation system function of the entire long-span space steel structure system as the theoretical basis for the application of construction technology,and the MIDAS software as the calculation and monitoring tool for the displacement of the common nodes at the junction of the"life"and"death"substructure areas in the simulation process of the construction technical scheme,the construction technical scheme simulation and calculation monitoring of a case project provide a practical application reference for the construction and quality and safety assurance of the large-span space steel structure.