After almost twenty years of the Xingtai earthquake, more than thirty earthquake swarms and earthquake sequences (M≥4.0) are recorded in Shanxi seismic zone. It is suggested that in earthquake swarm activities of Shanxi, if earthquake swarms with U>0.6, K>0.89, h<1 appear, the mid-strong earthquake will occur in the eastern part of North China. Finally, it is discussed that the relationship between the activities of earthquake swarms and earthquake sequences occurred in Shanxi and the mid-strong earthquakes occurred in North China.