Abstract: To research the floatability of anthracite coal slime in Dashucun coal preparation plant,based on coal quality analysis,conducted the fractional releasing test and flotation speed test for magnetic separation tailings and primary coal slime. The results showed that when ash content of clean coal is 9%,the clean coal yield of primary slime ＞ 80% and ash content of tailings is 66%; and when ash content of clean coal is 10%,the clean coal yield of magnetic separation tailings reached to 80%,the ash content of tailing is 78%,which indicated that the slime has good floatability. Although clay mineral content is higher in coal magnetic separation tailings,but the content of the kaolinite only share small proportion of total slime,it has little effect on the flotation result under condition of pharmaceutical system in the laboratory.