Abstract: In order to design efficient and advanced coal preparation plant,the commonly used coking processes,coal quality characteristics of Antai coal preparation plant and surrounding existing coal preparation process were investigated. The optimum coal preparation process was that,for pre- desliming and main election by three- product non pressure heavy medium cyclone,1. 5 mm to 0. 25 mm particles was dewatered by TBS coarse slime separator,For- 0. 25 mm particles,the flotation was carried out first,then the flotation clean coal and tailings were recycled by pressure fliter. Actual production showed that the separation density stabilized at 1. 40 g / cm3,the clean coal ash was between 9. 28% to 10. 67%,loss rate of medium coal was between 1. 85% to 3. 20%,the calorific value of the medium coal remained at more than 23 MJ / kg.