In this paper, Xiongcun orebody No.I is taken as the research subject. The Re-Os model ages of molybdenit(4 samples) from Xiongcun orebody No.I are similar, ranging from (160.1±2.3) Ma to (163.4±2.3) Ma. Its isochron age is (161±11) Ma (MSWD=4.2) and error is big. Its weight average age is (161.5±2.7) Ma(MSWD=2.0) and error is small. So ore forming age of Xiongcun orebody No.I is (160.1±2.3)-(163.4±2.3) Ma and the most probability is (161.5±2.7) Ma. The authors conclude that northward subduction of Neo-Tethys resulted in mineralization of the Xiongcun orebody No.I in the Middle Jurassic. The tectonic setting is the island-arc environment. The deposit type of Xiongcun orebody No.I is island arc type porphyry copper-gold deposit.oft-com:office:office" />