Abstract: In order to make a profound study on the change rule of OH which was restrained by C₆F₁₂O in combustion process of aviation kerosene, a cup burner with optical windows was designed. Based on OH-PLIF (planar laser?induced fluorescence) technology, the "difference method" measurement which was used two different wavelengths, solved the problem that was caused by soot, kerosene and combustion cracking macromolecular compounds in combustion field of aviation kerosene. The OH distribution characteristic maps of twelve experimental conditions were obtained. The maps had important reference significance for studying the inhibition mechanism of  C₆F₁₂O, and they also provided basic dates for establishing theoreti-cal model of the inhibition mechanism. The experimental results showed that parameter H which meant the vertical height of OH distribution was stretched slowly if  C₆F₁₂O was low volume fraction (<3.91%). However, parameter H would decline rapidly then gradually gently if the concentration  C₆F₁₂Owas rising continuously. In addition, parameter D which meant the thickness of OH distribution zone and parameter S which meant the proportion of OH distribution area were showing obvious downward trend if the concentration of  C₆F₁₂Owas rising continuously.

Key words: aviation kerosene,  C₆F₁₂O, OH-PLIF, combustion inhibition, fluorescence signal, difference method, OH distribution