Abstract: In order to improve the fine coal separation performance of the turbulence bad, an internal structural part was fixed in the turbulence bed in order to impr ove the separation effect.A comparison analysis was conducted on the separation effects of the turbulence bed before and after the internal structural parts fixed.The re sults showed that as for 1.500.25 mm fine coal with ash content of 21.57%, in order to make the cleaned coal with ash content not over 10.00%, the superficial water ve locity of the conventional turbulence bed should not be over 23.50 mm/s, the ash content of the cleaned coal and the cleaned coal production rate were 9.00% and 72.5 6% individually and the probable error Ep value was 0.123 g/cm3.Under the same test conditions, the turbulence bed with the internal structural parts could restrain the misplacement effect of the coal particle in certain degrees, the coal particle based on the density different separation tendency could be enhanced and the separation p erformance of the turbulence bed could be improved. Thus the cleaned coal ash content and the cleaned coal production rate would be 8.83% and 80.12% and the Ep V alue was 0.085 g/cm3.