All of Chinese iron ore reserves are lean ores and the resource utilization is very low. Led by the idea of engineering philosophy and based on technological integration and creation,Ansteel Group established the "five grades ganged" engineering management mode. It views mining and metallurgical engineering, including the geologic,mining,ore blending,concentration and smelting engineering,as a whole and considers the geological,mining,feed,concentrate and charging grades together with objective of the integrated optimization of the overall costs. With the establishment and application of the "five grades ganged" mode,Ansteel Group has solved the lean iron ores exploitation problem and supported the"self-sufficiency-based" resource strategy.