Abstract: Objective To evaluate the mechanical behaviors of auxiliary interface framework structures in prefabricated underground station and improve the assembly rate of such stations, it is necessary to conduct research on the mechanical performance of above-mentioned framework structures. Method A 1:2 scaled experimental test is carried out on the joints of previously mentioned frameworks. A validation analysis is conducted using Abaqus finite element model. Result＆ Conclusion During the loading process, diagonal cracks appeared at the ends of steel-concrete beams in entrance/exit frameworks. The development of these diagonal cracks weakened the concrete confinement of the top reinforcement, leading to bond failure and cracking at the reinforcement ends, this affects the ultimate bearing capacity of the specimens. Throughout the loading process, internal force transfer between the interface framework structure and the main structure remains consistently reliable. The established Abaqus finite element model accurately reflects the bearing capacity, deformation characteristics, and crack propagation law of the specimen, therefore is applicable for further research. Studies on the mechanical performance of auxiliary interface framework structures in prefabricated underground stations contribute to improving the assembly rate of underground stations, shortening construction periods, enhancing labor productivity, and promoting the transformation and upgrade of the construction industry.