Abstract: The heat transfer characteristics of nitrogen in coal determine the generation of NOx and its final emission amount in combustion process，which has great significance in controlling and governing the NOx pollution during combustion process． In this paper，the heat transfer process was divided into two different heat migration paths，volatile nitrogen and coke nitrogen． It was also summarized the heat transfer characteristics and related factors of volatile nitrogen and coke nitrogen in the combustion process． At the end，a breakthrough of the “quantitative analytical thermal migration process of nitrogen in coal”was achieved，which is an international academic puzzle．