The transfer of Daxing International Airport will be basically completed in 2021. This paper introduces the development experience of multi-airport systems in New York，London，Dubai，Tokyo，Singapore and Shanghai. For example，the London Airport Group and the Tokyo Airport Group locate the functions of airports in terms of service objects and geographical locations respectively；in terms of route network distribution，the London Airport Group takes the form of “main hub + auxiliary hub.” The Tokyo Airport Group is divided into domestic and international routes；in terms of how to improve airport competitiveness in cooperation，The Dubai airport group makes great efforts to develop infrastructure，while the Singapore airports highlights the passengers-oriented characteristics；in terms of airport traffic connection，as for Europe’s Well-developed air-rail intermodal transport，Beijing can optimize the “air-rail-air” three-dimensional intermodal transport between the two airports；In terms of freight and logistics services，Memphis Airport and Singapore Airport invest in high-tech equipment and formulate strict logistics service standards. It is believed that the Beijing Capital International Airport should focus on the development of high-quality cargo transport，while Daxing Airport can tap market potential to further enhance the cargo transport volume.