Semi-rigid connections, which have the advantage of simple on-site construction and fast installation, reduce the requirements of restraining stiffness of the columns, improve the deformation and energy dissipation capacity of the connections, and then improve the seismic performance of structure, but few researches have been done on such joints. This paper presents an experimental study and analysis on 3 top and seat angle steel connections of concrete-filled steel T-section column and steel beam under low-cycle repeated horizontal load. The failure mode and seismic performance of top and seat angle steel connections are studied. The results indicate that the strength and rigidity of such joint are mainly determined by the strength and rigidity of top and seat angle steel; specification of highstrength bolt and thickness of angle steel have a direct impact on the seismic performance of joint; the equivalent viscous damping factors of 3 specimens are greater than 0.3, all joints have good earthquake resistant capability; the top and seat angle steel connections, which have good energy dissipation capacity but low strength, are applied to the joints with small moment. The results provide the theoretical basis to the study and application of top and seat angle steel connection.