Abstract: According to the ratio of the seismic energy released by the M≥7 earthquakes in the Eurasian Seismic Belt to that released by the earthquakes with the same magnitude range in the whole world, we analyzed the relationship between the seismic enhancement of the Eurasian Seismic Belt and the occurrences of M≥7 earthquakes in the Chinese mainland based on the χ² test of significance. The results show that when the ratio of the annually seismic energy released by the M≥7 earthquakes in the Eurasian Seismic Belt to that released by the M≥7 earthquakes in the whole world is above 50 percent and an M≥8 earthquake occurs in the Eurasian Seismic Belt, in the following three years there would be more than one M≥7 or M8 earthquakes occurring in the Chinese mainland. The test of significance under the significance level of 10 percent for this relationship can be passed.

Key words: Eurasian seismic belt, Enhancement of seismicity, M≥7 earthquakes, The χ² test of significance, Chinese mainland