Abstract: Behavior of airline mergers in recent years become more frequent, whether the airline's merger behavior should be regulated by Untitrust Law or not, it decides by the combined effect and if it can be exempted, this article make a comparative study of china Antitrust Law and the American and European countries or regions' law on airline mergers about this act's effect of evaluation criteria, the exemption system and the extraterritorial application of specific provisions. It expounds China law has some defects that is not strong operational presence on airline mergers and dose not have a clearly defined on the relevant market and public interest, proposed a corresponding improvement of airline mergers involving the definition of the relevant market and airline mergers and exemption system.