Abstract: There is a refractory molybdenum mine in Hebei province,Using a optical microscopy,manual artificial heavy concentrate,X-ray diffraction (XRD),electron probe micro-analyzer (EPMA),molybdenum minerals and accompany minerals category and content of samples were studied.including chemical compositions,species,grain size,embedded characteristics,modes of occurrence of molybdenum minerals.,and the reasons of this refractory molybdenum mine.This mine is complex mineral assemblages.Results also showed high oxidation rate of molybdenum and mudding degree.Perlimonite is the main carrier mineral of molybdenum,but the perlimonite collection which is filling in the fissures,micro-cracks of the ore show colloidal structure and veinlets structure The grain size of perlimonite is more about 10um.These are not conducive to dressing enrichment.