Abstract: This paper reports a Reynolds averaged Navier-Stokes（RANS） modeling study that investigates the effects of heat extracted（Qout/Qin） through the furnace wall and the internal exhaust gas recirculation rate on the performance of premixed combustion.Results suggest that both the exhaust gas recirculation rate and the ratio Qout/Qin play important roles in establishing premixed flameless combustion.It is found that,to realize flameless combustion,not only a large exhaust gas recirculation rate is needed to dilute local fuel and oxygen concentration and to delay the fuel oxidation,but also a sufficiently high value of Qout/Qin is required to control the local peak and the uniformity of temperature field inside the chamber.