With the development of coating technology and its cost reduction,government offices try to strengthen environmental protection policy all over the country.In this case,it is good chance for auto-parts industry to promote the use of pure water paint system with the low VOC emission.By comparison,it will be better for controlling VOC emission at its source than for treating VOC at the end.In this article,the pure water paint system with the low VOC emission was introduced for automobile wheel hub.At the same time,the analysis of difficult problems and their solution were presented during the pure water paint system was implemented.