The gradual emergence of the international open hub is accompanied by economic development. This paper explains the connotation of international open hub，and combs its evolution stages：it has gone through the stages of pre-hub，single hub and comprehensive hub，and is moving towards the stage of digital hub. The location factors of Airport Economic Zone of Daxing International Airport are identified in this paper. Close to PKX airport，a super large-scale international comprehensive hub，supported by multiple policies，with the international industrial ecosystem and overseas development environment，Daxing airport economic zone has the basic conditions to become the key node of domestic large circulation and the link of domestic and international double circulation. In the future，this area should strengthen the function of international hub. Relying on the cooperation between Beijing and Hebei，connect to international factor resources，and focus on the development of digital economy.