利用周期图，最大熵谱分析及最优分割方法，对东北地区地震活动的时间序列进行了分析处理。研究结果表明，东北地震时间序列具有比较复杂的周期结构，在时间间隔为２２ａ～２４ａ的主周期中，尚蕴含有时间尺度分别为１０ａ和１２ａ～１４ａ的次周期。两者地震活动水平的差异，构成了东北地震活动的平静与高潮时段。在上述研究的基础上，对东北地震活动进行了详细的分期研究，并对未来东北地区的地震活动趋势进行了估计。 The time series of seismic activity in northeastern China are analyzed and processed by means of periodogram, maximum entropy spectrum analysis and optimal segmentation method. The results show that the time series of the northeastern earthquake have more complex periodic structures, and in the main period of the time interval of 22a ~ 24a, Shangyun contains the sub-periods with the time scales of 10a and 12a ~ 14a, respectively. The difference between the two levels of seismic activity constitutes the period of calm and orgasm of seismic activity in Northeast China. Based on the above studies, detailed staging studies on the seismic activity in Northeast China are carried out, and the seismic activity trends in the future in Northeast China are estimated.