Abstract: For improving fine coal flotation performance, flotation test is made with the flotation feed of Puxian Energy Company′s Coal Preparation Plant after it goes through surface modification treatment using high-shear conditioning technology. Test result shows that flotation process is superior to conventional process in performance. At a desired ash of flotation concentrate of 10%, a pulp conditioning speed of 2 000 r/min and a conditioning time of 2 min, the yield of concentrate and recovery of combustible matters are seen to increase by about 8 percentage points and 7 percentage points, respectively, with a reduction of diesel consumption by 45 percentage points.