Abstract: The particulars design is key factor in renovation of coal preparation system in Datun coal preparation plant,because production condition and process in coal preparation plant is difference,so the design for each particular point should also difference.The article analyzed the design scope and related particulars in coal separation system,presents the particulars design that will affect the quality and throughput should pay attention in the design of dense medium washing system,coarse slime recovering system,floatation system and washing water purification system.