Abstract: This investigation involved the formation and release of precursors of NOx，which are HCN and NH3, during coal and its char gasification. Gasification was carried out in a fixed bed reactor at atmospheric atmosphere. Gasification agents and gasified temperature were two key effects on the release amount of nitrogenous compounds. Results show that with an increase of reaction temperature a great amount of NH3 is formed during gasification of coal and its char with steam; the yield of NH3 is highest at 800 ℃ during gasification of coal and its char with CO2; the volatiles in coal plays the key role in the formation of HCN and NH3 during coal gasification under steam atmosphere; the yield of HCN during coal gasification is independent of gasification agents and increases with an increase in gasified temperature.