Sanchagou gold deposit is located in Zhongtiao Mountain which is the famous polymentallic mineralization belt in China. Through Re-Os isotopic method ,the isotope age of molybdenite is identified, obtained the new data of 1823±23Ma.the result indicated that molybdenite from Sachagou gold deposit formed in the transitional period of the Paleoproterozoic era later.Considing the molbdenite Re-Os age of copper deposits in the Zhngtiao Mountain area which the predecessors obtained, we believe that the Zhongtiao Movement (the period of Luliang ) is the important molybdenum metallogenic period. Therefore ,the Re-Os age of molybdenite in the Luliang period not only confirmes the Pre-Cambrian metallogenic period existence,but also indicate the prospecting direction to find out molybdenum deposit and the metamorphic porphyry-type copper-molybdenum ore in this area.