Abstract: A copper-molybdenum mine of low grade in Hebei mainly exist in form of chalcopyrite and molybdenite,which have complex disseminated relationship with gangue minerals.The condition tests on the grinding-separation process are studied.The results show the flowsheet of "raw ores grinding-bulk flotation of Cu and Mo-regrinding composite concentrates-copper molybdenum separation",the experiment index of concentrate grade of Cu at 25.32%,the recovery of Cu at 89.04%,concentrate grade of Mo at 8.52%,the recovery of Mo at 84.35%.