Abstract: Satellite timing is one of the key technologies of time synchronization in smart grid. Aiming at the problems of low reliability and unstable timing performance caused by traditional satellite timing in smart grid, this paper first introduces two satellite timing methods, namely position domain timing and observation domain timing. Then an adaptive satellite timing enhancement algorithm is established to fuse the two timing methods. Finally, experiments are designed to verify the adaptive timing enhancement algorithm based on Beidou satellite navigation system(BDS). The results show that the Beidou navigation system replaces the GPS system, which enhances the overall security and availability of the system. At the same time, the satellite adaptive timing enhancement algorithm proposed in this paper improves both accuracy and stability of satellite timing by about 17.1% and 25.2% respectively.