The invention discloses a method, boundary router and system for controlling inter-domain routing change, wherein in the method for controlling inter-domain routing change, when receiving routing change information published in a cross-domain manner, the boundary router extracts routing information, a routing information signature associated with the routing information and a digital certificate of an AS, which a routing change information publisher belongs to, from the routing change information; the routing information signature is decrypted by utilizing a public key associated with the digital certificate; if decryption is successful, the routing information as a routing candidate item is added into a routing table database; and thus, updating of a routing table is realized. The routing information signature published in a cross-domain manner is subjected to safety verification by utilizing the secrete key associated with the digital certificate; therefore, security threats, such as routing detouring and counterfeiting of a routing attack, due to protocol security vulnerabilities can be effectively solved; and thus, credible change control to BGP inter-domain routing can be realized.