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In order to improve the slave synchronization accuracy with respect to the master clock for asymmetric communication links,a delay asymmetry correction algorithm is designed. The key ideal is filter clock updates devived from the master-slave message exchange,using ony good sampes for slave updates.The advanced enhanced time recovery algorithm which two consecutive filtering was proposed, make sure that only good samples are used to update the slave clock correctly under heavy traffic load in the network.The proposed algorithm can easily be integrated into PTPV2 protocols,and not influences the basic message exchange. The test results show that the new algorithm can effectively mitigation delay asymmetry jitter in the presence of various bursty bi-directional traffic loads and network conditions, the synchronization accuracy between master and slave clocks is batter than 100ns.