Abstract: Abstract: A study is made of the promoting effect on flotation of oxidized coal product by agent C-1，compared with the flotation effect of traditional agents. Promoting mechanism of agent C-1 by Infrared Spectroscopy and Wetting Heat. The result show that the agent C-1 can be chemically adsorbed on the oxygen-containing functional groups on the surface of the oxidized coal, thereby improving the hydrophobic property of the surface of the coal particles. It significantly improves the yield of clean coal, the recovery rate of combustibles, and the perfection of flotation, and reduces the ash content of clean coal. When the amount of foaming agent is 100g / t and the amount of agent C-1 is 1200g / t, the minimum coal ash content is 12.02%, the flotation perfection index is36.35%, and the flotation effect is the best.