Abstract: Based on the continuous connecting medium model, the formulae for calculating yield displacement and ultimate displacement of ductile coupled walls considering shear deformation were derived theoretically. The modified compared truss model was employed to analyse the shear deformation of the plastic hinge region. For the first time, the relationships between curvature and displacement ductilities of ductile coupled walls were established and verified by comparing with experiment results of 13 coupled walls. The comparison showed that the displacement ductility factors considering shear deformation have a lower level of scarcity and better uniformity. The ductility relationship established for ductile coupled walls is suitable for ductility analysis and capacity design of coupled wall structures.