The　long-span　steel　structure　of　Beijing　New　Airport　Terminal　Building　is　an　over-limit　high-rise　building　structure.　Its　maximum　structural　length　is　504　m　and　its　maximum　span　is　125　m.　In　order　to　investigate　the　static　and　seismic　performance　of　the　overall　structure　composed　of　a　C-shaped　column　system　and　an　upper　roof　structure,　a　static　test　and　a　pseudo-static　test　were　conducted　on　a　1:10　scale　model　of　the　structural　unit　in　the　C1　area　of　the　roof　steel　structure　of　the　Beijing　New　Airport　Terminal　Building.　The　results　indicate　that　the　experimental　values　of　the　structural　response　under　vertical　loading　is　consistent　with　the　finite　element　analysis　values.　The　failure　modes　of　the　C-shaped　column　structure　under　horizontal　cyclic　loading　were　the　buckling　and　fracture　of　local　members.　After　the　failure　occurred,　the　bearing　capacity　of　the　C-shaped　column　structure　did　not　decrease　significantly　and　the　deformation　did　not　increase　significantly.　It　indicates　that　the　C-shaped　column　structure　has　a　good　overall　stability.　The　energy　dissipation　capacity　of　the　C1　overall　structure　was　relatively　stable,　and　the　stiffness　degradation　of　the　structure　was　significant　when　it　entered　the　elastic-plastic　state.　The　failure　mode　of　the　C1　overall　structure　was　in　the　form　of　plastic　hinges　at　the　end　of　the　generalized　beam,　which　met　the　structural　design　concept　of　＇strong　columns　and　weak　beams＇.　The　C1　overall　structure　can　withstand　the　impact　of　rare　earthquake　of　magnitude　exceeding　9　degrees.　The　structure　has　a　high　safety　reserve　and　good　seismic　performance.　©　2020,　Editorial　Office　of　Journal　of　Building　Structures.　All　right　reserved.