This article discusses controlling the cost of pig iron on the premise of expensive ore， which is considered as a system engineering， including economical purchase， production foundation and scientific burden. The new idea was proposed for cost control of pig iron. Burden component should be according to the local features of the enter- prise， mading use of the advantage of different minerals and complementing their weaknesses. The effect of raw ma- terial changes on production should be minimized through improvement of smelting technoledge and burden compo- nent changes of raw materials， to ensure the stability of production and furnace conditions and maximum economic efficiency.