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Reasonable and objective geothermal water quality assessment can provide a scientific basis for the development and utilization of geothermal water resources. Based on the chemical data of the Quaternary sediment reservoir (Q) and the Lantian-Bahe Group (LB) in Xi’an, the entropy weighted TOPSIS method was used to evaluate the water quality of geothermal water. The results show that the chemical indices (except for TH) of the LB geothermal water exceed the standard with poor quality. For the geothermal water of the Q, only NH4+ and Fexceed the standard. The excessive NH4+ and Fare due to human activities and the dissolution of fluoride bearing minerals, respectively. Comprehensive assessment based on TOPSIS evaluation model also reveals the geothermal water quality of the Q is better than that of the LB. Besides, the entropy weighted TOPSIS method has good applicability in the quality assessment of geothermal water. Keywords—geothermal water; water quality assessment; entropy weighted TOPSIS method; Xi'an

Geothermal Water Quality Assessment Based on Entropy Weighted TOPSIS Method in Xi'an, China