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Through analyzing reports of the complains and the test results collected from Hainan nearly 10 years,It could be found out that the area of the body where corrosion happens is more concentrated and typical.This study mainly investigated the corrosion case,structure design and protection methods of medium and premium car modules which are in the sale of domestic market,and recommended solutions for typical areas of body which is prone to get rusty from standpoints of structure design,sealing protection and process control methods.