Since July 1, China's national phase VI motor vehicle pollutant emission standard for heavy diesel vehicles has been officially implemented throughout the country. It is prohibited to produce and sell heavy diesel vehicles that do not meet the national VI emission standard, and imported heavy diesel vehicles shall meet the national VI emission standard. It is reported that the national six emission standards have upgraded and improved the automobile exhaust test procedures compared with the national five, and the automobile exhaust pollutant emission limits have been stipulated. The severity has been increased by 40% ~ 50%, and the emission of main pollutants has been nearly doubled. From this point of view, the upgrading of automobile exhaust emission products is an essential work for major automobile enterprises.