The characteristic of performance-based seismic design is that the structural seismic design is transformed from macroscopic goal to specific multiple objectives.At present,the national code 《Building Seismic Design Code》(GB50011) only provides the deformation index of the elastic and elastic-plastic for the whole structure,not for individual components,without quantifying the damage index.Therefore,this paper firstly carried out the reversed cyclic load tests on shear behavior for 5 T-section RC shear walls with HRB600 steel bars,and the aseismatic performance differences between high-strength bars and ordinary bars of shear wall was studied.Combined with the experimental results of shear resistance performance worldwide,the modified Park-Ang double-parameter seismic damage model is proposed,which can capture the seismic damage of shear wall under shear failure.The modified damage model can evaluate shear wall's damage degree during different loading phases. Based on the damage assessment of shear wall member,quantization indexes of different performance levels for displacement angles of RC shear wall structure were proposed.