Abstract: Applying the theory and method of system engineering, the dynanic relation models about mine benefit object and main technical indexes, including industrial indexes of ore deposit, reserves average grade,loss rate dilution rate and beneficiation feed grade, have been built. Based on these models, the multi-object decision technique has been used to optinzed these indexes dynamically. Asignificant economic benefit has been gotten by using the research result, for example, a added profit of 10 million RMB per year was gotten in Waitoushan Iron Mine and Meishan Iron Mine.