Due to the low production capacity of grinder，the grinding fineness can not reach the requirement of subsequent flotation，the poor result of flotation in Concentrating Mill of Jinchiling Gold Mine，Duan’s semi-theoretical formulate of ball diameter and the technology of accurate ball loading and addition were applied to calculate the initial ball scheme and extra ball scheme，besides，improve the grinding effect and flotation index by improving the site grinding process and increasing the mineral liberation degree.The industrial test results indicate that the adoption of accurate ball loading and addition method can bring a grinding mill production capacity increase by 5%~8%，grinding fineness of three ores increase by 7.16，14.03 and 12.13 percentage points respectively，electricity consumption decrease by 9.94%，11.47% and 10.14% respectively，unit consumption of grinding media decrease by 21.31%，15.84% and 17.83% respectively.Especially for the third ore，the degree of flotation tailings decrease by 35.29%，the recovery rate increase by 2.46 percentage points.The results indicated that the adoption of the technology of accurate ball loading and addition has bring a good production effect and a remarkable economic benefit，so it has a better using and popularizing value.