Abstract: An afterburners was designed to get aviation engine extra thrust, but higher inlet temperature will generate higher NO_x emission. One V style structure test facilities was adopted as an afterburners flow fields stabilizer, the section concentration of different NO_x and O₂ emission from the afterburners were analyzed in condition of inlet T 600 ℃ to outlet T 600~1 200 ℃,the test was fulfilled at 4 experimental conditions of same flux and flow fields.The results show that the chamber combustion is of "higher temperature, rich oxygen, poor fuel" characteristics,most Oxygen consumption in an afterburner chamber is contributed to generate CO₂ and in the emission temperature scope of 800~1 200 ℃,the NO thermal generation is restrained and affected by incomplete combustion product CO evidently.