Abstract: Because of the low efficiency of the flotation system of the plant, the quality indice of the flotation products are difficult to control. To tackle this problem and in line with the actual conditions of the flotation process and equipment currently used, the primary-only flotation process is converted to a primary + secondary one without adding any new equipment. Field application of the renovated system has met with remarkable result as evidenced by not only elimination of the previous troubles and improvement of flexibility of flotation system, but also a rise of yield of flotation concentrate by 8.09 percentage points, bringing about a favorable economic benefit for the plant.