Abstract: This papre has deeply discussed the general characteristics of the strain of crustal rock formation and obtained in theory:1) the abundant and esvsential condition of the development and occurrence of earthquakes is that the accumulation of elavStic deformation volume of crustal rock deformation is bigger than the change of the plastic deformation volume;2)before macroscopic rupture,the crustal rock formation probably shows a deformation accumulation stage.If the knowledge proves to be correct, it will become a breakthrough point of short term and imminent prediction of earthquakes.According to the knowledge that the key factor of whether an earthquake develops and occurs depends on the rate of elastic vertical differential movement of crustal rock formation, which was put forward by the author in 1993, this paper has preliminaryly discussed the crustal rock formation strain and a new way of earthquake prediction in theory, and preliminaryly gives a quantitative identification index of seismic risk area and safe area.The paper also gives the mechanism of seismic stress transmission and concentration which is a vertical and vshear horizontal transmission and concentration.