Abstract: Since the 1920s, there have been more than 30 research methods for water quality assessment worldwide. However, there is no widely accepted evaluation model for groundwater quality evaluation because of the complex nonlinear relationship between water quality grade and evaluation factors, as well as the fuzziness and randomness of water pollution. At present, geographic information system (GIS) technology is widely used in water quality evaluation, and on this basis, a series of new models and theories of water quality evaluation have been put forward. This article takes the Daniudi gas field shallow groundwater as the research object. ArcGIS technology is adopted to integrate GIS with an improved fuzzy comprehensive evaluation model. Therefore, a groundwater quality fuzzy comprehensive evaluation model based on GIS can be created and applied to the groundwater quality evaluation of the research area. In order to verify the rationality and reliability of groundwater quality evaluation, the fuzzy comprehensive evaluation results based on GIS are compared with those with the Nemero index method. The results show that (1) the quality of shallow groundwater in the Daniudi gas field is generally good, and is mainly in class I and class Ⅲ, but the shallow groundwater in some local areas is polluted by nitrogen from domestic sewage, agricultural wastewater and livestock sewage. (2) An effective integration of fuzzy comprehensive evaluation model (FCEM) and GIS combined effectively, and the combination makes FCEM have powerful map display and spatial analysis functions, which make the systematization and visualization of fuzzy comprehensive evaluation of groundwater quality to be realized. (3) Compared with the Nemero index method, the fuzzy comprehensive evaluation model of groundwater quality based on GIS can evaluate the quality level of the collected groundwater with reasonable accuracy.