This paper explores possible measures of enhanced control of the nitrogen oxides (NOx) emission from combustion on a new circulating fluidized bed (CFB) test platform, which is a combined CFB and post-combustion chamber (PCC). Characteristics of Shenmu char combustion and NOx emission were studied on the conditions of the secondary air (SA) arrangement, lean oxygen combustion, and post-combustion, respectively. In comparison to the conventional methods (SA arrangement), post-combustion is a new method to improve control of the NOx emission during the cornbustion process. Experimental results show that the approach of modifying the SA arrangement is able to remove the NOx emissions by up to 30%, the lean oxygen combustion can reduce NOx emissions significantly but resulting in a declined combustion efficiency, and post-combustion is able to bring the final concentration of NOx emission down to only 51 mg/m(3) (at 6% O-2), meanwhile maintaining the high combustion efficiency of 98.6%.