1. College of Earth Sciences，Jilin University，Changchun 130061，China; 2. Qinhuangdao Mineral，Hydrogeology and Engineering Geological Team of Heibei Department of Geology and Mineral Industries，Qinhuangdao 066001，Hebei，China; 3. National Research Center of Geoanalysis，Beijing 100037，China

Taipingcun Mo deposit is located in the western Malanyu anticlinorium core，and the southern cen- tral Yanshan- - Liaoning molybdenum (copper) metallogenic belt． The ore bodies are mainly hosted in metamorphic rocks and breccias along the exocontact zone of Yanshanian intermediate- acid intrusive bodies． Besides，sparsely disseminated molybdenite mineralization was found in concealed porphyritic monzonitic granite in deep． It indicates that molybdenum mineralization in the area is associated with the intrusive rocks． The Re - Os dating of seven mo- lybdenite samples collected from the deep ore bodies shows the model ages ranging from (162. 5 ± 2. 5) Ma to (165. 7 ±2. 5) Ma，the weighted mean age of (164. 11 ± 0. 92) Ma，MSWD = 0. 82 and the isochronal age of (164. 4 ±3. 9) Ma，MSWD =1. 7，which indicates the deposit formed in the late Middle Jurassic． The Re content of molybdenites is 18. 79 ×10 ^－6 ～66.65 ×10 ^－6 ，with an average value of 41. 86 ×10 ^－6 ，suggesting a mixing ori- gin of the materials from crust and mantle． The ore- forming age and materials of the Taipingcun Mo deposit are ba- sically consistent with those of the Xiaojiayingzi Mo deposit in Liaoning，the Tangzhangzi gold (molybdenum) de- posit，Yuerya- and Xiayingfang gold deposits in eastern Hebei． All belongs to the Yanshan- -Liaoning molybdenum (copper) metallogenic belt． These deposits are resulted from the third phase of the tectonic- magmatic- metallogenic events of Yanshan - - Liaoning molybdenum (copper) metallogenic belt．