Abstract: In order to effect automatic, timely and constant dosing of flotation reagent and tackle the problems encountered in the case of using micro electromagnetic or manually-operated valve, an elevator bucket-type electronic intelligent flotation reagent constant dosing controller is developed. The paper presents an introduction to the working performance of the controller as verified through laboratory-scale test. As evidenced by experimental result, the controller is high in control accuracy and well up to the requirements for automatic, timely and constant dosing of reagent.