Abstract: The Yangshan fluorite deposit has been found to be the first fluorite mineral reserve in Henan Province, and its scale has reached a super large scale. Its metallogenic geological background and deposit geological characteristics show typical hydrothermal fluorite deposit characteristics. The results show that the δ ¹⁸O in the fluid inclusion water of the Yangshan fluorite deposit is between-8.9 ‰ and-5.5 ‰, with an average of-7.4‰; δ D is between-88.6 ‰ and-76.1 ‰, with an average of-83.27‰; the δ¹⁸O in the fluid inclusion water is between-3.8 ‰ and-2.8 ‰, with an average of-3.3 ‰, and δ D is between-94.5 ‰ and-94.25 ‰, showing obvious magmatic hydrothermal and hydrothermal characteristics The mixing characteristics of gas and precipitation are different from the H and O isotopic characteristics of quartz in madui fluorite deposit and shimenzhai fluorite deposit in the same area, but basically consistent, suggesting that the fluorite deposit in this area is closely related to Yanshanian granite, and meteoric water is obviously mixed into the ore-forming fluid in the later stage of mineralization; the REE characteristics of wall rock and ore show that there is no external change in the mineralization and alteration process of the deposit In addition, the ore-forming materials are derived from mantle or lower crust, and the ore-forming fluid is in a lower temperature reduction environment.