The geothermal resources in Gaoqing County are of sedimentary basin type. The main thermal reservoirs are porefissure sandstone reservoirs of the Paleogene Dongying Formation. The outlet water temperature of the wellhead ranges from 53 ℃ to 76.8 ℃,and the hydrochemical type is NaCl.The geothermal field is a conductive geothermal system affected by tectonic control. According to the characteristics of main ion components and their correlations, hydrogen and oxygen isotopes, it is confirmed that the source of geothermal water in Gaoqing hot field is recharged by late Pleistocene atmospheric precipitation, and its genetic type is sedimentary water, which has a long detention time and strong water- rock interaction.