Abstract: According to the analysis of the nature of middlings of the Bailong coal plant, the production rate of middlings about washed coal take for 16.55% of raw coal, ash content of+13mm middlings is low. Clean coal can be dissociated by middlings crusher, and coal comprehensive utilization can be improved, and designed re-election programs for the preliminary, and analyzed the economic efficiency of the coal re-election, and firmed the whole production index is more stable.