In recent years

with the establishment of power system information disaster recovery centers

still higher requirements are placed on the clock synchronization for electric power business and the clock synchronization network plays a vitally important supporting role for the electric power communication network.This paper explains the necessity of the OTN support to clock synchronous transport when SDH networks are gradually replaced by OTN equipment deployed in large scales in power communication networks in the future.On the basis of analyzing the synchronization technology

it proposes a unified OTN+ PTN-based synchronous network model and conducts the relevant system tests.The results show that this networking mode satisfies the synchronization requirements of the electric power business.