What is discussed here is that the earthquake precursor have their own physical model, which is divided into the load stage, the stage of stalemate, the unload stage, the short stage before occurrence and the quake stage. Up till now, numerous earthquakes that occurred worldwide have proved that the quake-breeding physical model of destructive earthquakes may repeat and reappear. An analytic method is brought forward for tracing the information on the warning signs of an earthquake and predicting earthquakes step by step. Also, earthquake prediction is preactically divided into stages, making it possible to realize the predicting of destructive earthquakes.