Abstract: In this paper, a new method for earthquake prediction, called aftershock vector method, is discussed, Studies have shown that, after a main earthquake, there exists a relationship between the line of the mainshock vector and the last biggest aftershock and the next correlative earthquake occurred in a certain area.By using the known data, such as vector length, time interval between the mainshock and the last biggest aftershock,and the earthquake magnitudes of the mainshock and the biggest aftershock, the three elements-place, time, and magnitude-of the next earthquake possibly occurred in a certain area can be predicted.