Abstract: Aimed at the maximum of economic benefit and mineral resource recovery benefit during iron deposit mining, the ore grade index of Baiyunebo Iron Mine in China was optimized by constructing three system models, including ore reserves model, mineral processing model and technological economic analysis model, and by adopting fuzzy comprehensive evaluation. The results showed that the cut-off grade of magnetite ore in Baiyunebo Iron Mine should be readjusted from 20% to 15%. As a result, the mine economic benefit could be increased more than 120 410 000 yuan RMB and the iron concentrate recovery was more than 91.54×10⁴ t.