Abstract: In this paper, We studied fault plane solutions of 16 main shocks as well as their foreshocks and strong aftershocks occurred in China and its vicinity. The results show that the fault plane solutions of the foreshocks are rather consistent with that of the main shocks, but some of the aftershocks occurred generally in a day or two after the main shocks are markedly different. The above characteristics might help to estimate the tendency of occurrence of large earthquakes.This difference in fault plane solution may be caused by either local stress field or by various complicated dislocations along fault planes in the focal regions.