In order to study fine coal in the air dense medium fluidized bed,an experiment has been made by adopting air dense medium fluidized bed,and a preliminary study has been done for separating 3~6 mm fine coal in the bed height 150,200,250 mm.Laboratory equipment uses the cylindrical fluidized bed with 170 mm in diameter,and 500 mm in height.The experimental results show that most of the high density of fine coal is accumulated in the lower part of the bed,while low-density fine coal tends to gather in the upper bed.This increase is mainly due to plasmid degree in composition and fluidization conditions to achieve the minimum separation of particles,resulting in poor separation effect.