Abstract: The method of prediction for the earthquake risk area is recently developed on the basis of the evolutionary diagrams of radon in ground water. The paper introduced in detail the process of the new method. It includes the evolutionary diagram of variation rate of radon concentration in ground water, correlation between the evolution of the diagrams in the anomaly areas and the earthquake locality, and the sign and method of prediction for the earthquake risk area. Test prediction shows that the method is effective and can be applied in the earthquake prediction.

Key words: Radon in ground water, Evolutionary diagrams, Risk area prediction