Abstract: Taking Kailuan Group Donghuantuo Coal Preparation Plant as an example, the feasibility of combining five coal seams into two coal seams for coal quality analysis was demonstrated from three aspects of proximate analysis indicator, size consist and densimetric consist through comparative analysis of a large amount of data. In terms of proximate analysis indicator, coal, ash, sulfur and calorific value were compared. The coal seam occurrence conditions and mining methods are compared in terms of size consist. The density levels of elemental ash and floating ash were compared with each other in terms of densimetric cosist.