The test results showed that the response spectrum of the synthesized acceleration time history using the above proposal can represent the mean level of ground motions with different random phase spectra. The observed data of the Northridge earthquake was also used to test the effect of this improvement. 算例检验的结果表明,得到的加速度时程的反应谱,能够表征基于大量随机相位谱合成的地震动的平均水平,亦借助北岭地震的实测数据,验证了改进方案的可靠性和有效性。