In this paper,we analyze the frequency and strain energy of seismic activity of the Datong window from October 1989 to October 2016. The attenuation fitting result of monthly frequency from the Datong window show the characteristics of segmented alternating activity,including three active periods and two background periods. When the Datong window is in the active period,earthquakes occur intensely in the Shanxi seismic belt and Zhangjiakou-Bohai seismic belt;when it is in the normal background period,less earthquakes occur in the two seismic belt. The strain energy result indicates that strong earthquakes of the Ordos block' periphery has a direct impact on the Datong window;the more magnitude of strong earthquakes and the shorter distance from the window,the earlier the strain energy anomalies appear in the Datong window and the greater the amplitude. Additionally,strong earthquakes of the Qinghai-Tibetan block induce more effect on the Datong window,while that of western Pacific plate has a weak effect on the window. The Datong window after strong earthquakes of surrounding block may be related to the geological and tectonic environment,and therefore it is sensitive to the change of stress filed.