Abstract: In order to improve efficiency of coal slime flotation,reduce cost in Tunlan coal preparation plant,reagent test and its optimal dosage are investigated by collecting agent kerosene,ZFC emulsified oil,frothing reagent 2-octanol. The results show that coal slime flotation by ZFC emulsified oil is better than by kerosene; and it can be treated best under condition of 1 000 g/t ZFC emulsified oil,90 g/t 2-octanol,with 94. 35% recovery of combustibles of flotation concentrate and 49. 72% perfect index of flotation.