Abstract: In order to obtain the sample similar to natural coal and provide deep processing of coal with high-quality imitation of original coal sample,the method of preparing artificial post-carbonization coal sample was discussed in this paper and then heat transmission and the rule of temperature field evolvement were analyzed in the process of carbonization based on the experiment scheme that was designed for post-carbonization; Post-carbonization coal sample was acquired through experiment. The results show that the increased rate of temperature in the centre of coal sample was quick before it became slow and reasonable heat-up time was about 15 000 seconds.