Analysis of Ore-Controlling Structure of Lujing Uranium Ore Field in Hunan-Jiangxi Border Chen Bailin Institute of Geomechanics，Chinese Academy of Geological Sciences，Beijing 100081，China Lujing uranium ore field is one of the most important hard-rock uranium ore fields in South China. There are many small uranium deposits and occurrences such as Lujing large uranium deposit (322), Shabazi (327), Gaoxi (326), Huangfengling (325) and Niuweiling (324). The surrounding rocks of uranium ore bodies in the ore field are Mesozoic granite and Cambrian shallow metamorphic clastic rocks. Uranium ore bodies in granite are controlled by NNE(NE)-oriented faults (a little NEE-oriented), while uranium ore bodies in shallow metamorphic clastic rocks are controlled by NWW (near east-west)-oriented faults. The ore-guiding structure of the ore field is the regional extensional tectonic environment and its related magmatic activity and rock intrusion structure; Ore-matching (transporting) structure is a high-angle normal fault and rock mass emplacement structure which is connected with deep gas-liquid thermal fluid, and its upper part is connected with ore-bearing structures in different directions. Ore-bearing structures can be structural traces formed during mineralization, structural traces formed before mineralization and active structures during mineralization, while ore-controlling structures must be those during mineralization. The ore field structure has gone through nine stages: basement fold formation, Indosinian intrusion, early Yanshan intrusion, NNE-trending ore-bearing structure formation in the late early Cretaceous, EW-trending basic dike intrusion in the late early Cretaceous, uranium mineralization in the late early Cretaceous-early late Cretaceous, uplift and denudation in the early late Cretaceous, red bed basin covering and burial in the late Cretaceous-early Paleogene, and uplift and denudation since the middle Paleogene. There is no necessary genetic relationship between Fengzhou red bed basin and uranium mineralization, and it plays a role in protecting uranium deposits formed earlier than it. The favorable areas for further prospecting are Fengshuxia-Niuweiling-Jiaoyelong-Shabazi area and Dachangping-Dongfangzi-Lujing-Miaobeilong area covered by Fengzhou red bed basin. Key words: ore-controlling structure; ore-bearing structure; further prospecting for uranium deposits; Lujing uranium ore field; Hunan-Jiangxi Border.