Kongxintou copper molybdenum depositproduced from skarn which formed via contact metasomatism between Jiaodong Weideshan superunit Yuangezhuang monzonitic granite and Jingshan Group marble. The main orebody occur as lenticular, cystic and veined controlled by fissure structure within the rock body. This research studied the molybdenite, chalcopyrite and magnetite adopting inductively coupled plasma mass spectrometry and thermal ionization mass spectrometry testing Re-Os isotope technology respectively. The results show that the Re-Os isochron age of molybdenite is 117±1 Ma, chalcopyrite is 118±34 Ma, which consistent with Shangjiazhuang molybdenum deposit and Lengjia molybdenum deposit. Those ore genesis relate to Weideshan superunit, indicating the presence of the Late Yanshan molybdenum mineralization events in Jiaodong. However the magnetite can not get Re-Os isochron age due to poor sealing property. Chalcopyrite Os isotopic initial value Osi= 03 ± 002, shows the Kongxintou copper molybdenum deposit into a source of crust mantle mixed, formed from the back arc extension of Pacific plate subduction to the Eurasian continental in the early Cretaceous.