In this paper

the principle of the synchronous protocol of the IEEE1588 is analyzed

and the factors that affect the accuracy of synchronization is summarized.Through the hardware timer in a microcontroller

we give the exactly the time when a package is sent or received.So synchronization of the distributed clocks can reach 1 μs in this way.Another method to improve precision of the synchronization is to replace the traditional fixed frequency crystal of the slave device

which needs to follow up the master clock

by an adjustable VCXO.So it is possible to fine tune the frequency of the distributed clocks

and reduce the drift of clock

which shows great benefit for the clock synchronization.A test measurement shows the synchronization of distribute clocks can be better than 10 ns using this method

which is more accurate than the method realized by software.