The authors collected molybdenites with different occurrences and elevations from different ore bodies of Pingdi molybnum deposits for Re-Os isotopic dating. The isochron age of (102.9±1.8) Ma (MSWD=2.1), and the model age of (107.4±3.3) Ma (MSWD=16) were obtained. This results indicated the multi-stages mineralization with three types of molybdenite such as fine veins in rock of K-feldspar granite, thick veins in “bedding joint” of K-feldspar granite and in breccia silicified rocks controlled by fractures, which were formed in different metallogenic phases, (111.20±1.7) Ma～(111.60±1.6) Ma, (105.60±1.6) Ma～(107.40±1.6) Ma and (103.70±1.7) Ma, the mineralization periods during late stage of early cretaceous. This isotopic data provided the new geochemical evidences for Mesozoic tectonic magma evolution and guided regional ore-exploration of Pucheng-Ningde NW tectonic belt of Southeast coast of Fujian Province.