Abstract: The core technology in the production of titanium dioxide by chlorination is the gas phase oxi-dation of 'TiCl Oxidation reactor is the core equipment in the production of titanium dioxide by chlorina-tion method. The opening structure of jet ring in oxidation reactor directly affects the mixing effect ofTiCl and 0,. This paper adopt computational fluid dynamics ( CFD ) method to research the effects offive different jet ring structures on fluid mixing.'The radial concentration distribution of 'TiCl, gas in thereaction tube and the non-unifomity of 'TliCl and 0,mixing could be obtained.The results show that theopening stnucture of the jet ring has a significant impact on the material mixing. The material mixingeffect of the combined opening jet ring is better than that of the uniform opening jet ring，which is moreconducive to the rapid and uniform mixing of TiCl,and o,.