Wet air in the large car arrester system is to be subjected to high pressure influence to cause dew. It will cause installation kit decay over a long period of time use, make car arrester system to move expiration, this drier is together with car arrester system desiccators. Its characteristics is quickly to absorb the moisture in the high speed air flow, it can be reborn, its strength is high and powder fall rate is low, it can insure to make car arrester system safely and vehicle safety movement.