The numerical simulation analysis model of air distribution in single-aisle cabin civil aircraft is built.The flow field, temperature filed, PMV, PPD and DR are calculated and analyzed at different air-supply angle,different air-supply velocity and different air proportion between the high outlet and low outlet. The results show that horizontally supplying air at the low and high outlet, high velocity for low outlet and low velocity for high outlet, and more air for low outlet and less air for the high outlet are suitable.