The chemical classification of groundwater is an important way to recognize the formation of groundwater by classifying chemical constituents in groundwater according to the relevant rules. However, the pollutant will become the part of the chemical composition of groundwater under the condition of groundwater pollution. This paper applied the method of adding N03' to the Shukalev classification. The study show that the changes in hydrochemical nomenclature have made up for 17.2% since NO3' was taken into account. The hydrochemical types of N03, C1*N03 and HC03 * N03 have been added. The area of HC03 type increase slightly in the original Schukalev classification while the others decrease. The conventional hydrochemical classification is mainly adapted to judge the natural causes of groundwater, but it is not adaptable for the chemical classification of groundwater which is related to man -made pollution components because the human activities greatly contribute the original environment of shallow groundwater change. Therefore, NO3' prompts the groundwater pollution research of the hydrochemical classification.