Abstract: The anomaly verification is an important part of improving the earthquake prediction ability. The diagrams of Piper,Schoeller,Gibbs and Giggenbach,and the mixed proportional method,called as"four figures and a method",which is a reliable analytical method for the groundwater anomaly verification. The Piper diagram and Schoeller diagram can be used for the determination of the hydrochermical types and the recharge of groundwater. Groundwater chemical composition can be defined as derived from atmospheric precipitation, rock dominance, and/or the evaporation-crystallization process by using Gibbs diagram. The diagram of Giggenbach is applied to determine the state of water-rock equilibrium and whether there is deep fluid activity. The mixed proportional method is appropriate for calculating the mixing degree of groundwater. We also summarized the basic principles of using hydrochemical methods to check groundwater anomalies and its water sampling and testing techniques. These hydrochemical methods can be used to verify that whether the fluid anomalies is related to tectonic and/or non-constructive activity,and to improve the scientific level of anomaly judgment.

Key words: Hydrochemistry, Groundwater anomaly, Anomaly verification, Tectonic activity