Abstract: Taipingzhen rare earth deposit is a newly discovered medium-sized light rare earth deposit in Henan Province. It occurs in the south side of the Waxuezi fault in the arc of the North Qinling magmatic island. The ore body is vein or lenticular in the NW-trending tectonic altered cataclastic rock zone. The geological characteristics of rare earth ore bodies are summarized，and the ore veins were studied by chemi⁃ cal analysis，rock and mineral identification，stable isotope，quartz inclusion test，and U-Pb dating of bastnasite. The results show that the ore-forming material of the deposit is mainly derived from mantle， supplemented by crust-mantle mixed source，which is a rare earth deposit of medium-low temperature flu⁃ id genesis. The formation of ore bodies is closely related to CO₂-rich fluids. The metallogenic epoch was in the late Caledonian period. Silicification，fluorite，barite，pyrite and other structural alterations are closely related to rare earth mineralization.

Key words: rare earth deposit, orebody characteristics, isotope, fluid inclusion, metallogenic model