This study conducts nonisothermal combustion experiments of three types of pulverized coal by Synthesized Thermogravimetry Analyzer in O2/N2 and O2/CO2 atmospheres. It analyzes the changes of combustion characteristic parameters of pulverized coals in different atmospheres and calculated the kinetic parameters at each condition. The results show that combustion characteristics under O2/CO2 atmosphere are different from those under O2/N2 atmosphere at the same O2 concentration. When N2 is replaced by CO2, both ignition time and burnout time of pulverized coals increase, burnout temperature is higher, and combustion characteristic index declines. DTG curves of coal combustion move to low temperature zones when O2 concentration in O2/CO2 mixture increases. It indicates that both ignition and burnout temperature are lower, burnout time decreases, combustion characteristic index obviously increases, and combustion performance of pulverized coals are improved. Activation energy, frequency factor and reaction order at lowtemperature stage are lower than those at hightemperature stage. Kinetic compensation relationship exists between combustion activation energy and frequency factor in different atmospheres.