Abstract: The problems faced by Fuxing Plant are undercapacity of flotation system, low ash of flotation tailings caused by undercapacity of concentrate dewatering equipment, and deterioration of quality of circulating water. To tackle the problems, work is made by the plant on sieve analysis of flotation feed, concentrate and tailings. Based on result of test data and comparison of technical transformation schemes, the existing flotation system is renovated through adding a double-cell XJM-S16 flotation machine as scavenger and a quick-open membrane filter press for attaining a higher concentrate dewatering capacity. Following the renovation work made, there have been seen an improved coal washing process and higher adaptability of flotation system to variation of coal property. Practice shows the use of the renovated flotation system has led to the rise of the yield of concentrate by 15.81 percentage points, increase of the overall yield of clean coal by 2.96 percentage points, drop of calorific value of tailings by 6.07 MJ/kg and the yield of additional annual economic revenue of 18.034 8 million yuan.