Abstract: In dense medium separation process,the density control effect of heavy medium suspension directly decided to dense medium separation of product quality.This paper aim at dense medium coal cleaning process use medium suspension density and medium barrels of liquid level changes of time-varying,nonlinear and so on characteristics,using an adaptive fuzzy PID algorithm,dense medium coal cleaning process control model is established.The model consists of the modal recognizer and fuzzy PID adaptive controller,synergy to select executed valve,dielectric shunt valve and water regulating valve,in order to realize the control of the medium level slurry density and medium bucket,and the industrial operation test.Results show that using an adaptive fuzzy PID algorithm of dense medium coal cleaning control system,the suspension of medium density and dielectric barrel level control precision,and fast response speed,satisfies the requirement of coal cleaning process control.