Abstract: In order to explore the dynamic changes of groundwater level in Tongnan High-tech Industrial Development Zone from the dry season to wet season, the authors in this paper combined traditional hydrogeological survey methods to analyze the groundwater types and distribution and obtain the hydrogeological parameters, based on 35 water geological drilling data and 5 existing monitoring well data. Three hydrogeological units were divided according to the interpolation analysis of the static groundwater level data, and the groundwater level variation characteristics of hydrogeological boreholes and monitoring wells within each unit were analyzed. The results are as follows. ① Shallow groundwater level responds quickly to precipitation infiltration recharge, with an increase in water level amplitude, but there is also a time lag. Partial areas receive rainfall replenishment for approximately 2 days. ② Daxigou, Lusi Creek and Fujiang River are the erosion base level for the three hydrogeological units respectively. For boreholes near the erosion base level, the variation of groundwater level is slightly affected by rainfall. ③ The elevation of the borehole in Zone Ⅰ is almost positively correlated with the groundwater level inside the borehole, while boreholes with soil layer thickness exceeding 5.0 m in Zone Ⅲ have the same correlation. ④ For boreholes with soil layer thickness greater than 5.0 m in Zone Ⅱ and Ⅲ, and greater than 10.0 m in Zone Ⅰ, the variation of groundwater level shall not exceed 0.40 m. The research results have guiding significance for the assessment of groundwater environmental impact in Tongnan Hi-tech Industrial Development Zone.