Types of hydrogeochemical anomaly are influenced by age of groundwater,which is an indirect parameter of intense degree of water rock reactions.The younger water, which means the water cycles underground in a short period, will not well reflect the changes of geochemical environment in crust, while the older water will not reflect the changes in time. From study of this paper, the following results are obtained:(1) The younger water or the older water often show the short impending changes. (2) Changes of geochemical elements in the middle age water show the long period trend one.The lasting time of the anomalies after earthquake is relative to the age of groundwater.