As the interior environment of armored vehicle cabin is special, air conditioning can effectively improve the combat environment, and improve the comprehensive combat ability of armored equipment. The purpose of this study is to achieve the cooling effect and meet the thermal comfort of human body at the same time, also if it can reduce the energy consumption meanwhile is a good option. This paper analyzed the thermal parameters of the typical armored vehicle cabin, simplified modeling of the armored vehicle cabin, and carried out the numerical simulation of the air flow in the cabin by using CFD software, verified the calculation model，in order to analysis the distribution of temperature field and velocity field，we get an appropriate air distribution designed by changing the angle of supply air, so as to ensure the thermal comfort of the armored vehicle cabin, to provide design basis for air supply angle of air conditioner. The result shows that 45° upward is the recommended supply angle, it can lead a reasonable air distribution, which can not only ensure the near body environment temperature is reasonable and comfortable, but also does not produce local discomfort, and the utilization rate of cooling capacity is the highest. It can be seen that under the same air supply temperature, by adjusting the air supply angle, the air distribution inside the cabin can be effectively adjusted, so that the passengers are in a comfortable state, and will not cause local discomfort.