Abstract:The automatic reagent feeder lias been improved and developed along with the development of industrial production and electronic technology. The accuracy of feeding of the improved reagent feeder is higher. It has cut- off protection and communication functions,closed circuit control and othet communication functions.Aremote control devise is used between control room and flotation shop. The improvement of the theoretical basis,technical mea- sure,application results,economic and social benefits, experiences and development trend are described in detail in this paper.