Abstract: Tangyu town located in the piedmont of Qinling Mountainistypicalrecharge area of geothermal water in Guanzhong basin.Its hot springs are very famous.With the rapid development of hot spring tourism in recent years, geothermal water exploitation increased year by year leads to water level drop as deep as 69.16 m onaverage.Thisaiticle focuses on the geothermal water in tangyu town and applies isotope and hydrogeochemistry methods combined with the conditions of geothermal geological structure to estimate the deep geothermal temperature,Study of the origin and regeneration of Tangyu geothermal water is of great significance to the protection and sustainable development of geothermal resources in the piedmont Qinling Mountain and Guanzhong Basin.