Abstract: The depth of Zhao Gezhuang well is 200 m. The observation aquifer is located in 182—200 m, which is a mixture of shallow cold water and deep hot water. Under the influence of mining and rainfall, the water level and water temperature have synchronous coordination changes in the long trend and annual variation. Due to groundwater exploitation, the ratio of cold water in the shaft reduces, the water level of the well decreases, and the water temperature raises. The rainfall infiltration recharge makes the cold water in wellbore increase, water level rise and water temperature drop. However, at the end of the rainy season, the inflow of cold water into the shaft decreases, and the water temperature rises gradually. The air pressure and the solid tide cause the diurnal variation of water movement between the wellbore and the aquifer, so that well water level has periodic fluctuation. This changes of the ratio of cold and hot water in the wellbore and causes the secondary effect of water temperature's periodic fluctuation. Both of them show synchronous and coordinated changes in diurnal variation. Different kind of interference factors causes different periodic change. It is necessary to choose different method and sampling period in order to eliminate the disturbance and extract the information of seismic anomaly.

Key words: Zhao Gezhuang well, Water level, Water temperature, Tide