Abstract: In recent years, airport aircraft noise reduction by optimizing flight procedures has become an important research direction for airport environmental protection. In this paper, a noise calculation model based on aircraft "noise-power-distance" data is established, and the relevant theories of average flight path and continuous climb operation (CCO) are introduced. Finally, by taking a large international airport as an example, the aircraft average flight path is used for noise prediction, and the integrated noise model is used to calculate the noise impact area, then the noise impact contour map are drawn to compare the noise reduction effect of the CCO departure with that of the conventional standard instrument departure (SID). The results show that the CCO departure procedure can effectively reduce the impact of airport noise, and the noise reduction effect is better in high noise impact areas.