Prediction to the First Curtain of Seismic Activity in Mainland China during 2lst Century

The research results on the relationship between the earthquakes over 7.0 in 20th century in mainland China, change of the inclination between the lunar path and the Equator,and the solar activity indicate: 1. the earthquakes over 7.0 in mainland China will be clustered in the time when the inclination between the lunar path and Equator changes from the maximum to the minimum; 2. the earthquakes will also be clustered in the even number cycles of solar activity. According to results above, based on the values of the inclination between the lunar path and the Equator,and solar activities for future 50 years the conclution is that the first curtain of the seismic activity in 21st century in mainland China would be from 2006 or 2007 to 2015.