Abstract: In order to investigate the effect of CO_2 component to combustion in the hypoxic atmosphere,while realizing low NOxcombustion of pulverized coal,experiments of coal combustion in hypoxic atmosphere were conducted on thermogravimetric analyzer.To simulate the real reaction atmosphere,effects of different O_2/CO_2 mixing ratios and heating rates to the combustion characteristic were conducted.The results show that a competitive relation is found between combustion and gasification of coal in the O_2/CO_2 mixing atmosphere,when the reaction temperature is below 1 000 ℃.Higher CO_2 content will improve the restriction level of pulverized coal combustion by gasification reaction with coal.Lower O_2/CO_2 mixing ratio will restrain the burnout of coal,while the ignition temperature is hardly impacted by the CO_2 content.A heating rate improvement of 10 ℃/min to 20 ℃/min will apparently enhance the ignition and combustion stability of coal,while improvement of 20 ℃/min to 30 ℃/min has no such influence.