Abstract: The average raw coal throughput of Halagou coal preparation plant is 3000t/h. The basic technology process is +13 mm raw coal was separated by three sets of shallow trough, besides -13mm raw coal was separated by heavy medium cyclone separation or directly was carried into the products storehouse. The cost of lump coal system is less 8.12 yuan/ton than the slack coal. After the feeding limit is adjusted from +13mm to +6mm, lump feeding increases 302.62t/h. The cleaned coal yield of theory is 85.51%, increasing 2.17%. The cleaned coal ash of theory is 4.61%, decreasing 4.61%. The quantity efficiency is 94.62%, increasing 4.28%. After all, this cost can be economized more than four hundred ten thousand yuan per year.