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As one of the key technologies in Ad hoc networks, clock synchronization is the prerequisite of important network functions. Main consideration in clock synchronization are the choice of global clock and the accuracy, in which the existing clock synchronization methods still suffer lack. In this paper, the network delay is measured in networking process, and the network nodes complete synchronization with each other using mutual synchronization method. The simulation shows the program improves the synchronization accuracy. And this program does not require special nodes, the synchronization frame overhead is small, the program is suitable for multi-hop and flexible Ad hoc networks.