In this study, investigations were made as to the effect of the maceral compositions and mineral matter content of Azdavay and Kurucasile coals oil the coking property. Chemical and maceral analyses and coking properties were determined for the products of the float-sink procedure. The coking properties were established oil the basis of free swelling index and Ruhr dilatometer tests. Maceral analyses showed that as the ash content of a coal containing both high and medium volatile matter increases, its affective maceral proportion decreases, and the coking property is affected in all unfavorable way.