Abstract: Thermal comfort is a important standard for assessing a cockpit air-conditioning system. A thermal comfort calculation model of air-conditioned cockpit is founded on the base of human thermal balance equation and thermal comfort hypothesis proposed by P. O. Fanger. Furthermore, the assessment method of thermal comfort is presented. As a result,the above-mentioned works lay a theory foundation for the thermal comfort quantitative assessment of air-conditioned cockpit. The thermal comfort of three kinds of air-condition scheme of the cockpit were calculated by using the thermal comfort calculation model and the thermal environment. quality of three kinds of schemes was assessed. The result indicated that the third scheme is the best one in terms of thermal comfort.