A method for implementing cross-domain jump includes: a second domain name server obtaining a cross-domain jump request of jumping from a first domain name to a second domain name sent by a browser, the request including a cross-domain user identifier corresponding to a first identifier of a user in the first domain name; the second domain name server obtaining a second identifier of the user in the second domain name corresponding to the user identifier, and generating a login state of the user in the second domain name according to the second identifier. The second domain name server recognizes identity of the user according to the second identifier, so that user does not need to log in while still maintaining the login state. Therefore, operation convenience of the user is improved. Further, a browser, a first domain name server and a second domain name server are provided.