Abstract: The concept was introduced about of Space Information Network. I}he present condition for research on satcllife network routing and the routing needs for satellite network topology were analyzed with space information network environment as background. Based on the routing safety needs for satellite network, the satellite network routing protocol was studied and an authentication routing protocol, based on double satellite network, was proposed. Furthermore,the safety of the authentication routing protocol was proved. The research finds that the safety of satellite network routing information is significantly advanced.

Key words: SIN, Satellite, Authentication, Routing