Abstract: In this paper, 46 potential seismic sources are divided for Shanghai and its adjacent areas, and the bedrock ground motion parameters in the central area of Shanghai are calculated by using the probabilistic seismic risk analysis method. The potential seismic sources that have a major impact on different periods of the response spectrum are analyzed, and the probability contribution of main potential source areas to different periodic response spectra is studied. The results show that for long period response spectrum, the probability contribution of the potential source area of long-distance high magnitude earthquakes increases with the increase of the period, and even exceeds the probability contribution of the potential source area where the site is located; in the seismic safety evaluation of long-period projects in Shanghai, the impact of potential source areas with high magnitude beyond 150 km should be fully considered; for long period structures such as super high-rise buildings in Shanghai, the seismic impact risk in the Yangtze River Estuary and the South Yellow Sea is large, and the seismic impact in Tancheng area can not be ignored, which should be paid attention to.