Abstract: The main useful mineral are magnetite,camsellite and boric magnesium iron ore and main gangue mineral are magnesium olivine,ophiolite,tremolite,phlogopite,aptite,pyrite,pyrrhotite and some carbonate minerals in a ore in Liaoning.The composition of the ore is complex,the relationship is close between different minerals,the magnetite is fine disseminated,it is iron-boron ores of being difficult to processed.The index of grade of Fe being 61.34%,and recovery of Fe being 89.63%,grade of B₂O₃ being 12.00%,and recovery of B₂O₃ being 51.41% were got on by using the flowsheet of stage grinding,stage magnetic separation recovering Fe and using the flowsheet o flotation recovering B the gangue of Fe and suitable conditions.