In order to improve product quality, reduce cost, increase enterprise competitive power, Integrated Automation System (IAS) should be applied. On the basis of the architecture of process industry IAS, according to the production procedure of Handan Iron and Steel Corporation, combining the famous Handan Iron and Steel Group experiences with the 3 layer structure, the Integrated Automation System with financial management system at its center and cost control as the main line is designed. Since it has been applied in Handan Iron and Steel Corporation. Remarkable practice benefits were achieved.