Abstract: Based on the situation of reduction of coking coal resouce in Tangshan coal field of Kailuan Group,it is needed to rely on mixed washing and saling to increase the coking coal output.In order to make full use of the advantages of coking coal in Kailun Group,satisfy the requirement of quality of coking industry,analyzed the production of coal preparation plants and coal quality,determined the principles of mixed washing and saling,that is guarantee the coal classificiation index wthin the limit of national standards,maintaining the simple mixing,and the thermal strength of fat coal and coking coal more than 50%.