Abstract: Masonry pagodas are outstanding examples of ancient high -rise buildings. Built long ago, many pagodas aresuffered from earthquakes. To prevent them from destruction by earthquakes, it is necessary to research on seismicreinforcement methods for them with mechanism of seismic disaster. Applying time history analysis method, the XingjiaoTemple? s Pagoda in Xi-an, Shaanxi Province which is a key national relic, the seismic analysis has been done for it underhorizontal and vertical affects by earthquake. In light of calculation results, the forming mechanism of masonry pagodas isdiscussed and some seismic reinforcement measures are put forward.