Abstract: With the continuous expansion of mineral processing scale, the amount of flotation reagent added is also increasing for the dressing mill. The traditional solenoid valve dosing machine can not fully meet the production demand due to the small dosage and insufficient accuracy, and the pulsating dosing machine is criticized because the maintenance amount is too large, and the dressing mill urgently needs an automatic dosing system that can realize the addition of large flow of chemicals, high precision and small maintenance amount. Based on this, BGRIMM has designed the automatic dosing system of BRFS metering pump by integrating the advantages of metering pump, making full use of advanced control algorithm and easy to understand operation interface. After six months of continuous industrial application in the dressing mill, the application results verify that the system not only has large dosage, high precision, small maintenance, but also simple operation, easy to understand monitoring screen, and can realize closed-loop remote chain control, perfect solution to the difficult problem of automatic addition of chemicals, bringing considerable economic benefits to the dressing mill. This paper mainly introduces the working principle, composition, characteristics and field industrial application effect of the automatic dosing system, which lays a foundation for the large-scale popularization of the system.