Abstract: The problem faced by Shuangliu Plant is that due to the use of outdated medium separating density control system, the heavy medium separation system is rendered unable to adapt to the variation of property of raw coal. Through upgrading and renovation of the existing control system, an intelligent heavy medium separation density control system that is highly adaptable to wide variation of raw coal property is developed. Practice shows that the use of the system, the heavy medium separation system is made possible to realize automatic control of equipment and automatic adjustment of process parameters, leading to therefore sharp rise of equipment utilization rate and separation efficiency, an increase of clean coal yield by 0.20 percentage points and a drop of medium consumption per ton of coal treated by 0.20 kg.