But for the bus, the use of full sheet metal body, the bus production needs to be large, and the vehicle electrophoresis before the vehicle phosphating, vehicle cathode electrophoresis technology is widely used in cars. Therefore, domestic enterprises seldom use vehicle cathode electrophoresis technology. In China, but the first vehicle phosphating, without the use of cathodic electrophoresis coating process, and then add hand coated phosphating liquid or spray antirust paint; Its advantage lies in preventing water injection in the process of production; Some enterprises use to inject cavity wax into rectangular steel pipe sealing, and enterprises use prestressed skin technology, can also play an anticorrosive role. Aluminum cooperation, the use of aluminum body and aluminum skin to improve the anti-corrosion performance of the body. It is claimed that the electrolyte used for cathodic electrophoresis can be contaminated twice by large amounts of residual electrolyte after use. Vehicle cathode electrophoresis has its advantages, but it also has some disadvantages. For large production enterprises, such as car enterprises, electrolyte residue is not much, but for buses, electrolyte residue is relatively more. That's not the case with cars, which are smaller and have special leaks. The cavity of the body skeleton is very complex. In the process of electrophoresis, it is inevitable to have water in it, which will cause corrosion in the process of use. Compared with the bus industry in the world, Chinese buses have some disadvantages such as poor reliability, lack of design ideas and big gap of parts. The automobile body anti-corrosion is a basic requirement, the domestic bus enterprises should pay more attention to the reliability and safety of the vehicle. Bus enterprises should focus on these three points while paying attention to details.