As the booming civil aviation industry has seriously polluted air and tremendously jeopardized environment, ICAO has published a specific goal on the reduction of civil aviation emission. Besides, petroleum crisis is more and more severe, consequently alternative energy and emission reduction form a strong impediment for further development of civil aviation industry. In this paper, focusing on how to solve the challenges faced by civil aviation industry, combining with current situation, three mitigating methods are introduced and contrasted. Furthermore, According to the historical data of civil aviation industry development, the feasibility and prospect of three solutions are analyzed with the method of AHP. Finally, considering present aviation techniques and time cost, a dynamic mitigating method to reduce aviation emission is proposed.