Abstract: To tackle the problem regarding the high moisture of flotation concentrate, study is made to reduce the concentrate moisture through the use of filter aids. Result of laboratory-scale vacuum filtration dewatering experiment shows that a noticeably good result can be obtained with the use of sodium dodecyl benzene sulfonate and three kinds of polyacrylamides. Among them, the nonionic polycrylamide proves to be most effective, and at a dosage of 50 g/t, the concentrate moisture can be lowered down to 21.0%, down by 7.5% against the figure of 28.5% when no agents were added. It poves that the addition of filter aid can lead to noticeable reduction of the moisture of flotation concentrate. The study result provides a theoretical basis for the effective dewatering of flotation concentrate in coal preparation plants.