Abstract: Based on the data of observation and water temperature infill test of Changyi 02 well, as well as the data of regional groundwater exploitation and rainfall, the influential factors of dynamic change of water level and water temperature were discussed. At the same time, the least square method is used to fit the dynamic changes of water temperature data. It is found that the fitted water temperature dynamic curve is correlated with the dynamic changes of water level in terms of shape, amplitude and phase. Changyi 02 well has the characteristics of tidal effect, and synchronizes with the tidal dynamics of the water level of the well.