Considering the factors such as mortar strength,ratio of openings and aspect ratio,Psudo-static tests on the seismic performances of the bottom walls of a 3-story masonry structure were conducted.The damage models,hysteretic properties,aseismic capacities,stiffness degradations and lateral displacements of walls were analyzed.The results show the damage models are significantly influenced by the ratio of openings,and not obviously affected by the mortar strength or aspect ratio.The hysteretic properties and aseismic capacities are unfavorable under lower mortar strength,larger ratio of openings and larger aspect ratio.The ratio of openings significantly affects the aseismic capacity.Before cracking,the influence of each factor on the speed of stiffness degradation is almost the same and the degradation is rather fast.While after cracking,the ratio of openings is the most prominent factor and the specimens with larger ration of openings degradate faster.The residual stiffness is about 20% of the initial stiffness when the specimens reach their limit load state.The distribution of lateral displacement of the specimens with lager ratio of openings exhibits an outer convex curve after cracking.