Abstract: Aiming at the “more of the two ends，less of middles” distribution phenomenon of grinding products，Meishan Iron Mine Dressing Plant uniting with Jiangxi University of Science and Technology carried out both laboratory test and industrial test to increase the uniformity of grinding products by optimizing the grinding parameters. Industrial tests are processed in 4# series of the plant for six months. During this period，based on the results of the laboratory test and the process survey，the grinding parameters including the steel ball size and matching，medium filling rate，grinding concentration，sand returning percentage and concentration of overflow are entirely optimized，combining with field production experience. After the optimization，for the ultimate grinding products in 4# series (overflow of second classification) at the fineness of about 0.076 mm passing 70%: 300~10 μm fraction(qualified) yield increased by 18.05%，and -10 μm fraction(over grinding) yield decreased by 1.60%. Separation index comparison of second classification overflows from 4# series optimized and 3# series not optimized in laboratory conditions is carried out. The results show that the former iron concentrate yield and recovery are increased by 9.54 and 6.60% respectively. In addition，after optimization of grinding parameters in 4# series，steel ball consumption，energy consumption of grinding，temperature of pulp in mill and also the noise from mill running have been decreased to some extent. To sum up，the achievement of grinding parameter optimum in 4# series should be put into promotion in Meishan Iron Mine Dressing Plant.

Key words: Granular uniformity of grinding product, Optimum-optimization, Separation effects, Grinding energy consumption