Abstract: With an aim to tackle the problem regarding the difficulty in press filtration of the high-ash fine coal of the small coal cleaning system, an analysis is first made of the property of the flotation tailings for indentifying the cause of the filtration difficulty. Based on study result, property of feed to filter press is improved through adding an appropriate closage of filter aid for better filtration effect. Through exploration of the feeding modes of slurry pump and plunger pump, it is observed that the combined use of the two kinds of pumps can lead to reduced filter press feeding timeand improved filtration result to a certain extent. In addition to the abovementioned measures, the filtration system is optimized through renovation for enhancing its adaptability and reliability. The adoption of the mensures has made it possible for the plant to better cope with the difficulty iin filtration of high-ash fine slime.