Abstract: By conducting the quasi-static test on C-shaped light-gauge steel shear walls filled with expanded polystyrene（EPS） particle lightweight concrete， this paper analyzed the effects of factors such as shear span-to-depth ratio， axial compression ratio， lightweight concrete strength， horizontal reinforcement ratio， and C-shaped light-gauge steel web plate opening on the seismic performance of the walls. The result showed that the shear strength of the wall decreased with the increase of shear span-to-depth ratio， and the failure mode transitioned from shear failure to bending shear failure； the shear capacity of the wall increased with the increasing strength of EPS lightweight concrete； increasing the axial compression ratio could improve the shear capacity of the wall to a certain extent， but after exceeding a certain limit， the contribution was not significant， and instead， it would accelerate the failure of the wall； the web plate opening of C-tshaped light-gauge steel had little effect on the shear capacity of the wall， but the ductility and energy dissipation capacity were reduced； the strength of lightweight concrete affected the strength of horizontal steel tie bars， and only increasing horizontal reinforcement ratio had a limited contribution to the shear capacity of the wall.