In order to effectively realize packet transmission network(PTN) time synchronization, this paper introduces the synchronization principle of 1588v2 protocol, analyzes the key technology of PTN realizing high-precision synchronization, proposes a phase compensation algorithm of network slave clock, and carries out the PTN clock synchronization test based on 1588v2 protocol+ synchronous ethernet. The test results show that the PTN network clock synchronization based on 1588v2 protocol+synchronous ethernet and slave clock compensation algorithm not only realizes high-precision phase synchronization, but also effectively improves the slave clock phase stability.