Seismic test on 12-story T-shaped coupled shear walls have been conducted under the U.S.-Japan cooperative structural research project on composite and hybrid structures. This paper discusses the mechanisms of the energy dissipation focusing on strength ratio of coupling beams to walls for coupled shear walls system (HWS). The factors affecting on the mechanisms of the energy dissipation are appointed as the ratio of the rotational angle and the yielding rotational angle of the coupling beams and the shear walls, and the ductility factor of the coupling beams. And the rationality strength ratio of coupling beams to walls on the energy dissipation is guessed by the expectant total energy dissipation and the ductility energy dissipation ratio of the coupling beams to walls.
