By introducing the three layer structure of Business Planning System, Manufacturing Executive System and Process Control System in stead of the Purdue model of five level, the Liaoning Paishanlou Gold Mine Integrated Automation System is designed and successfully implemented. The information flow, material flow and fund flow in the gold mine enterprise have been optimally integrated, and the processes of production and management have been optimally controlled and supervised. The intelligent control technology based on synthetic production index of grinding process provides effective control method for complicated production process.