Abstract: In order to improve the floatability of oxidized coal,conducted theoretical analysis of structure,surface properties of oxidized coal,using two ways of physical conditioning and adding modifiers to study and improve the floatability of oxidized coal. The experimental results show that the combined process of ultrasonic pretreatment prior to flotation and adding adjusting agent during the flotation process can improve the floatability of oxidized coal and obtain a higher yield of clean coal.