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通过能量比讨论了尾波振幅比的物理意义．使用北京遥测台网１９８９和１９９０两年１１０次地震的４８６条数字化地震资料，测定了尾波振幅比和能量比；并由分频的能量比估算了北京地区的尾波Ｑ值和平均自由程，进而试求了吸收品质因子Ｑｉ和散射品质因子Ｑｓ，得到北京地区地震波的衰减主要由于吸收所造成；给出了昌黎台的振幅比和能量比随时间的变化，其中有一些较大地偏离平均值的变化，这是否是孕震过程的反映，还有待于对更长时间的资料和更多震例的研究．
The physical significance of the coda amplitude ratio is discussed by the energy ratio. Using 486 digital seismic data of 110 earthquakes in 1989 and 1990 in Beijing Telemetry Station, the ratio of coda to the energy ratio was measured. The coda Q value and mean free path in Beijing area were estimated from the energy ratio of frequency division , And then the absorption quality factor Qi and the scattering quality factor Qs were tried to get the attenuation of the seismic wave in Beijing mainly due to the absorption. The amplitude ratio and the energy ratio of Changli station were given over time. Some of them deviated from the average Whether the change in value is a reflection of the seismogenic process remains to be seen in the study of longer data and more earthquakes.