A new method for groundwater quality evaluation was proposed to solve the problems of the traditional groundwater quality evaluation, such as difficulty in realizing dynamic, poor visualization effect, and unable to adapt to the spatiotemporal scale change. The new method visualized the groundwater quality monitoring points in the form of nodes by using knowledge graph technology. The groundwater quality evaluation method was componentized by integrating components and Web Service technology. Based on the comprehensive integrated platform, the simulation system of groundwater quality evaluation was built quickly and flexibly. The system realized the dynamic evaluation of groundwater quality under different time scales, different evaluation models and different evaluation factors. Multiple evaluation methods could be integrated, and the analysis results could be comprehensively analyzed and judged through human-computer interaction in a visual environment, so as to provide decision support for managers. The system was applied to the analysis of groundwater quality in Guanzhong area of Shaanxi Province, in order to provide a scientific basis for the utilization and protection of groundwater resources.