In order to study the seismic performance and deformation index limits of a new assembled shear wall, based on the seismic performance test of the new assembled shear wall made by the research group, a total of 216 wall models with different shear span ratio, axial compression ratios and longitudinal reinforcement ratios of edge members were designed using factor analysis method. The corresponding single push performance experiment was performed to investigate the structrual behavior. Based on the recognition of failure modes using finite element analysis, the failure modes were divided into three categories: bending failure, bending shear failure and shear failure. A criterion for classifying the failure modes of the shear wall was put forward. Referring to "Code for seismic design of buildings" (GB 50011—2010), six performance states were defined for flexural failure and flexural-shear failure, while two performance states were defined for shear failure. Based on the strain and bearing capacity of concrete and steel bars under the limit state of the component, the criterion of the performance state of the wall was determined. Finally, regression equations were derived through linear regression to determine the limit values of plastic displacement angles for componments under bending failure, bending shear failure and shear failure modes. Furthermore, deformation index limites with 90% guarantee rate were proposed for each failure mode, providing a reference for performance-based seismic design of new assembled shear walls.