Abstract: Study of deep fluid,especially study of deep heat fluid has become important content for studying the seismogenic process and precursory formation. In partic ular, change of shallow fluid, which results from activity of deep fluid, is important way to explore the method of earthquake prediction. Because the scientists underst and the change of deep fluidonly by studying shallow fluid in the rang e of current ability, studying correlation between deep fluid and shallow fluid, finding change of deep fluid by correlation is of impor tant significance in studying the seismogenic process and the precursory mechanism as well as the theory and method of earthquake prediction.

Key words: Underground fluid, Deep fluid, Shallow fluid, Earthquake prediction