Through the mechanism analysis of the brittle and mechanical properties of the powder coating under low temperature environment,the method of reducing the coating Tg and improving the toughness of the coating can be put forward to effectively improve the phenomenon of poor impact resistance of aluminum wheel huh powder in-20℃ low temperature environment.This research mainly through the study of resin and additives,successfully prepared a kind of automotive aluminum wheel hub primer powder coating,which has good Impact resistance of crushed stone in low temperature and meets the technical requirements of aluminum wheel hub coating.