The Taqian tungsten-molybdenum deposit is located in the Taqian-Fuchun metallogenic belt on the southern margin of the Yangtze plate. The authors have made a breakthrough in ore-prospecting work in recent years,and the results show that the metallogenic belt has good ore-forming geological conditions and prospecting potential. However, the research work is just in the starting period. In this paper,the authors determined the molybdenite age of the Taqian tungsten molybdenum deposit by means of ICP-MS molybdenite-Os isotope analysis. The model ages of 5 samples vary between 160.8 and 163.4 Ma; the molybdenite Re-Os isochron age is (162±2) Ma, MSWD=1.7,suggesting that the ore-forming process took place in late Early Jurassic. A comparison with the metallogenic time of other similar deposits in this area shows that the ore-forming time in the Taqian-Fuchun metallogenic belt is much later than that of the Dexin copper deposits, and their ore-controlling structures are different too. These phenomena might have had something to do with the tectonic backgrounds of different periods.