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An experimental study about pre-desliming flotation was made for the difficult-to-float coal slime from Tonghua, which is characterized by high content of clay mineral and high-ash fine fraction. The efficient desliming process was explored by small taper angle hydrocyclone, the particle size and mineral composition of cyclone products were analyzed, and underflow products were studied through progressive release flotation. The results show that (f)150 mm hydrocyclone is chosen as the main desliming equipment. In the process of ф150 mm and ф75 mm hydraulic cyclone series connection, the whole desliming efficiency of fine particles <0. 045 mm is up to 67. 73%, the ash content is 50. 10%,and the minerals of Kaolinite and illite are got enriched in overflow. The two kinds of underflow can be used as feed of the flotation alone or mixed,and compared with the direct flotation of the raw coal slime, both the combustible material recovery and clean coal production rate are improved by 2-3 times. [ABSTRACT FROM AUTHOR]