Abstract: To increase clean coal yield,the flotation system of Huoerxinhe coal separation plant was improved. The equipment selection and the technical layout of the system was introduced. The problems during commissioning period were analyzed. The improvement actions of column separation,clean coal dewatering and air supply were proposed. The flotation efficiency was analyzed. The flotation system was transformed by adding duckbill jet,flotation clean coal vat and feed tube of flotation column,choosing emulsion diesel and butyl alcohol as flotation reagents,dosing slurry of corase- coal- slime centrifuge and the flotation clean coal,changing filter cloth,regulating parameters of ceramic plates. After renovation,the yield of clean coal increased by 3% to 6%,the ash content of the tailing increased from 30% up to40%,the dewatering time decreased by 40%,the consume of reagents decreased to 1. 9 kg / t. Therefore,the expected renovation effect was achieved.