In order to study the dynamic performance and seismic capacity of the Tai Pagoda after deviation rectification，the in-situ dynamic test of the pagoda was carried out. The vibration signals of each floor excited by the ground pulsation were gathered and the dynamic properties of the pagoda were acquired. Based on the varying of the dynamic characteristic parameters，the flexibility curvature method was used to identify the damage of the ancient pagoda and determine the damage of the structure. The numerical calculations of structural dynamic properties were carried out and compared with the test results. The mechanical parameters of the materials used in the Tai Pagoda were determined according to the consistency of dynamic characteristics. The plastic damage model was introduced and the seismic damage of pagoda′s structure was analyzed excited by three seismic waves. As results，the first two vibration frequencies of the pagoda in the east-west and north-south horizontal directions are relatively close，and the damage rate in the third and the sixth floors of the pagoda is slightly higher. The damage of the pagoda′s structure first appears on the floor with serious initial damage after the earthquake and the damage accumulation is more significant than that of other floors，and the final damage presents most serious. Penetrating cracks are always occurred along pagoda eaves and surrounding openings that cause the damage of pagoda′s structure. The research results can provide references for evaluation to seismic capacity of the ancient masonry pagoda.