Abstract: The roof structure of Beijing Daxing International Airport Terminal Building is a long-span steel structure. It is an over-limit high-rise building structure with a maximum structural length of 504 m and a maximum span of 125 m. Static and pseudo-static tests were carried out to study the static and seismic performance by making a 1:10 scale model of overall structure of C1 area of the roof steel structure of Beijing Daxing International Airport Terminal Building. The space static loading test was conducted on 9 full-size complex tubular joints to examine the effect of stiffening ribs, steel grades, and loading modes. The results indicate that the experimental values of the structural response under vertical load is consistent with the theoretical values. Local members buckle and fracture are the failure modes of the C-shaped column structure. After the failure occurs, the bearing capacity of the C-shaped column structure does not decrease significantly and the deformation does not increase significantly. It indicates that C-shaped column structure has a good overall stability. The energy dissipation capacity of the C1 overall structure is relatively stable, and the stiffness degradation of the structure is significant when it enters the elastic-plastic state. The failure mode of the C1 overall structure is that plastic hinges appear at the end of the generalized beam, which meets 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.