In Internet network, clock synchronization is of great significance.One of these areas is the network time delay measurement, at present, China's network rapid development, the network flow is very important for individuals and businesses, observation of a segment and the whole network is very important, because of the different routing algorithm, the condition of network congestion, packet length in the process of transmission is different also, by detecting the packet network time delay can be concluded that the network congestion status, rather than precise measurements of the network time delay, the precondition is the clock synchronization system, only through the clock synchronization system will each goal station clock synchronization, can accurately calculate the packet transmission delay accurately.
