Abstract With the rapid development of auto industry and people's living standard is increasing day by day, the car began to enter homes. People always pursued in the security and reliability of cars at the same time, now also pay more attention to comfort requirements. Therefore, air conditioning system as a modern cars equipped with basic, also become inevitable. In recent years, environmental protection and energy problems as the world has become the focus of attention of the influence of the development of the auto industry key factors all kinds of alternative energy hybrid car KongDiaoYe appeared to put forward the new subject and challenges. Since the s automotive air conditioning since birth, along with the car development and popularization of air conditioning system, air condition in the development of go through five stages: a single heating stage, a single air conditioning phase, the changes in temperature and integration phase, automatic control stage, computer control stage. Air conditioning control method also experienced from the simple to the complex, again by complex to simple process. As the car air conditioning system control c