In this paper, we recollected all data of the M≥7(1)/(2) earthquakes occurred in China during the years 7 B.C.-1976. The new catalogue of earthquakes have new improvement mainly in the region of west China. we discovered two predominant distributions, before or after each earthquake (M≥8) and another earthquake(M≥7.5). There's hardly any difference between the work of professor Xu Shaoxie et al. and the two predominant distributions, one at a shorter distance of 500-600km, the other at a longer distance of 1150-1300km. In addition, we found that the dispersion would be best if less than 30 years of time difference between two earthquakes, We also found the similar result of strong earthquakes occurred in U.S.A.