Abstract: he Bangor area of Tibet is rich in hot spring geothermal resources. In this study, 11 hot springs with good exposure in Bangor County were selected to collect and analyze water chemistry and isotope data. Geochemical methods are used to quantitatively analyze the hydrochemical characteristics, reservoir temperature, recharge and hot water age of the geothermal system in order to achieve the goal of sustainable utilization of hot spring geothermal resources in the Bangor area. The chemical type of geothermal water in the study area is mainly HCO₃-Na water, and the water-rock interaction is the main salt source of geothermal water in the area. The trace elements F, Li and SiO₂ are enriched and have a strong positive correlation with Cl, indicating that there is a greater possibility of deep fluid mixing in hot water. The geothermal reservoir temperature is estimated to be 32~ 161°C by geochemical thermometer. The hydrogen and oxygen isotope data show that the main recharge of hot water comes from atmospheric precipitation, and there is a slight ' oxygen drift ' phenomenon. The elevation of the recharge area is 5954m~6707m;the tritium content is generally less than 1TU, which can be qualitatively judged that the underground hot water is mainly supplied by sub-modern water before 1952. The research results provide some basic data for later drilling exploration and provide scientific basis for the rational development and utilization of regional geothermal resources.