Abstract: To compare the coal slime flotation effect of using aryl and alkyl agent,taking dodecyl benzene,dodecane and isododecane as collectors,and use Xinxing coal as test samples,conducted the coal slime flotation tests.The results show that for flotation of Xinxing slime,the best pulp density is 100g/L and mass ratio of collector and frother is 10∶ 1.Under the condition of different dosage,the flotation effect of dodecyl benzene is better than that of dodecane or isododecane.Undeer the best collector dosage of 1.25kg/t,the yield of clean coal,combustible matter recovery and flotation perfect index by using of dodecyl benzene is higher 5.24%,6.11% and 2.37% respectively than using of dodecane,and higher 1.62%,2.03% and 1.41% respectively than using of isododecane.