In this study, we investigated the influences of carbon residue content in coal ash and coal char on the melting behaviors. The coal ashes and coal chars with different carbon content were prepared by the air oxidations of a coal char with different oxidation time. The melting behaviors of the prepared samples were evaluated by the shape changes during heat-treatment up to 1550℃ in a N_2 stream based on JIS M 8801. The results indicated the melting behavior strongly depended on the amount of residual carbon content; melting points increased with increasing the residual carbon content.