Abstract:The authors make a preliminary analysis of groundwater age, its measuring methods and problems to be solved, and point out that environmental isotopic dating is a fairly good dating method. Based on a review on the dating with 14 C age of groundwater, the authors feel it important to make a thorough study on hydrodynamism and water-rook interactions for the purpose of improving the quality of the dating of groundwater, and suggest bringing the dating into the whole research work.