Domain name resolution method and system and ECS recursive server

The invention discloses a domain name resolution method and system and an ECS recursive server, and relates to the technical field of data communication. The domain name resolution method comprises the following steps: an ECS recursive server obtains an ECS domain name request sent by a terminal of a user; the ECS recursive server sends iteration recursive messages not carrying the ECS information to one or more domain name servers in sequence until the ECS obtains a preset NS domain name; the ECS recursive server sends an iterative recursive message carrying ECS information to a corresponding GSLB according to a preset NS domain name, so that the GSLB determines a corresponding IP address according to the ECS information; the ECS recursive server receives the IP address sent by the GSLB; and the ECS recursive server sends the IP address to the terminal. According to the embodiment of the invention, the risk of user information leakage is reduced to the greatest extent while accurate scheduling of the CDN is