The heating performance of air-conditioning system was an important index in the experiment of air-conditioning system. The temperature of cabin area in two low temperature conditions was measured. When the air-conditioning system was turned on in low temperature environment, the interior and environment of aircraft cabins were heated up rapidly and the changing trend was consistent, while the skin temperature was heated slowly. During the heating up process, the cabin environment temperature was the highest, and the interior was the second, and the skin was the lowest. The temperature in the cockpit area was easier to reach steady state than in the cabin area during the heating up of the air-conditioning system in the low temperature environment. Lower Environment temperature would increase the temperature steady-state time in the cockpit area, but would not affect the temperature steady-state time in the cabin area. The results obtained the heating performance of air-conditioning system in low temperature environment, which had important significance for the subsequent optimization and operation of air-conditioning system.