Combining closed bomb with the selfdesigned device for collecting and measuring gasfired，the main components of gasfired (oxygen,carbon monoxide and nitric oxide) were tested quantitatively. The sensor was calibrated by standard gasmixture device and firstorder standard gas,and RSD≤2.5%. The satisfactory results are obtained from applying the method to the certain propellant formulation (shuangfang3,ETPE,and ZXR etc.).