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The study systematically demonstrated the environmental isotope characters and its evolution process of geopressured geothermal water in Xianyang by study environmental isotope,illustrated its recharge source,direction and age.The result shows:The main recharge source originated from meteoric water in period of pre-Holocene Epoch,which from the west and northwest of study area.Its renewable ability is relatively poor except partial deep fault slightly recharge from modem meteoric water.