Abstract: By analyzing observational data of Shuangqiao well in Tianjin for many years, the results obtained are as follows: (1)the regime of groundwater level is mainly influenced by the extraction of regional groundwater. (2)The anomalous forms of groundwater level are entirely ascending type or abrupt rise tape, without descending type. (3)There exist short-term anomalies of groundwater level in the time range of anomaly, without the long-term and medium-term anomalies. (4)The earthquake-response magnitude of precursory anopsalies of groundwater level is related to the attenuation or nuctuation of the seismic activities in seismogenic region.