Strong earthquakes often occurred in Taiwan and northweatern regions in China.The corresponding and symmetry relation of the seismicity in recent 100 years between two regions is discussed using mathematical statistics method.The results show that the probability of MS≥6.0 earthquakes in the northwestern region is 95.08% in two years after MS≥6.0 earthquakes in Taiwan region.The time interval among MS≥7.0 earthquakes with 90% confidence degree were 2~4 years for both regions.There is no obvious difference in distribution of time interval of MS≥7.0 earthquakes for two regions by analyzing corresponding relationship between seismicity of two regions.