Abstract: By quasi-static testing two sets of specimens of steel-concrete sandwich composite shear wall，including tests of the bearing capacity，deformability，failure mode of the specimens，valuable results were obtained from the tests，such as the typical failure modes， the hysteretic curves，skeleton curves，bearing capacity，ductility，energy dissipation capacity． In addition，it was also analyzed the influence of variations of out-of-plane bending moment on structural mechanical behavior． In conclusion，the failure patterns of specimens under compression and biaxial bending moment were compression-bending failure; and the hysteretic curves of all specimens were not plump， validating that the deformability and energy dissipation capacity of the specimens were general． In other words，the bigger the out-of-plane bending moment，the less the lateral resistance capacity and energy dissipation capacity of the specimens． The specimens’out-of-plane displacement in the plastic region increased significantly，and they had a divergent trend． The bottom section of the specimens could basically meet the plane section assumption．