Abstract: In order to study the seismic performance of buckling-restrained brace (BRB)-reinforced concrete frame bent (RCFB) structure, a four-story BRB-RCFB structure specimen was designed and manufactured, based on the prototype of the main workshop of a concrete reinforced thermal power plant consisting of a double-span frame and bent. The crack development and damage mechanism, hysteresis hoop, stiffness degradation law, deformation capacity of structure and energy dissipation capacity of BRB were studied by static cycle loading test. Results show that the system has plump hysteresis hoop, the BRB and RCFB can effectively work together to resist lateral force, terefore, the energy dissipation mechanism of this system can be realized. The measured axial force-axial displacement curve of the BRB shows that its energy dissipation effect is remarkable and the damping ratio of the structure increases. Suggestions are put forward for the shear structural design of the deaerator room and the two layers at the bottom of the coal-bunker room, the design of the weak parts of the rigid layer (it is composed of steel beams, steel braces and concrete beams) in coal-bunker room, the form of BRB and the model design test of a single structure.