The utility model provides a car discharge system and car, this discharge system of includes exhaust pipe to and locate the tail -gas clean -up unit among the exhaust pipe, still include: electric heating unit locates among the exhaust pipe for heat the tail -gas clean -up unit, detecting element is used for detecting discharge system's information, and detecting element includes tail gas consistency transmitter, is used for detecting tail gas concentration, and gives electric heating unit with the tail gas concentration signal transmission who detects, be less than when predetermineeing the concentration value when tail gas concentration, electric heating unit is out of work. In this scheme, only be higher than when presetting the concentration value in tail gas concentration, electric heating unit just works to it consumes to reduce unnecessary.