基于中国地震动参数区划图、华北平原地震带和汾渭地震带地震活动性参数、华北地区地震动参数衰减关系，计算北京地区50年、70年、100年不同超越概率水准下基岩峰值加速度。并分析各超越概率水准下的峰值加速度与50年超越概率10%的峰值加速度比值，发现各计算格点的比值普遍偏小，按照当前抗震设防标准，所考虑的地震作用偏于保守且安全。

 Based on seismic ground motion parameter zonation map of China, seismic activity parameter of north China plain seismic belt and Fenwei seismic belt, attenuation relationship for ground motion parameter of north China, this paper provides bedrock peak acceleration with exceedance probabilities of 63%, 10%, 2% in 50 years, 63%, 10%, 2.5% in 70 years, 63%, 10%, 2% , 3%in 100 years. The rations of bedrock peak acceleration with exceedance probabilities of 63%, 2%, 2.5%, 3% to that of 10% in 50 years are smaller than the value in Code for seismic design of buildings. So, the seismic affects will be conservative and safety.