"Auto society" is a kind of social phenomenon that arises when the industrial society developed to certain stage.China is entering automobile society with astonishing speed.But what makes one regret is that,China currently has not fully realized the huge costs of auto society,or made full preparations for entering into auto society yet.The author thinks that ,due to its own special national conditions,China will have to face four serious challenges,three conflicts and support huge costs of society,economy and environment in the process of entering into auto society.