Mineralogical characteristics of molybdenite from Pingdi molybdenite deposit in Wuyishan were studied based on field systematic investigation, sampling, morphology analysis by using polarizing microscope, ore microscope and SEM, polymorph study of molybdenite by using powder diffraction, and compositional analysis of molybdenite by using electron probe. The results show that ore types include mainly pyrite-sericite-quartz alteration rock type and structural breccia type. The types of polymorph of the two kinds of molybdenite all are 2H type, only small amount of molybdenite in structural breccia type ore is of the weak peak of 3R type. Contents of impurities of two kinds of molybdenite are lower than other kinds of molybdenite, but the contents of impurities of molybdenite of the structural breccia type ore are little higher than that of the pyrite-sericite-quartz alteration rock type ore, and the same with Re.