Abstract: In the practical application of the electronic device, if the case is not in communication with the external Internet, the measurement time is based on the equipment in the crystal periods measured as the time base. Since the crystal is affected by temperature, humidity, electromagnetic interference, mechanical vibration and shock, power fluctuations and other factors, the nominal value of will are not consistent with the actual value of the phenomenon, resulting in inconsistent time clock module to run after a period of time. In view of this problem, the author puts forward the corresponding adaptive synchronization control algorithm, and completes the design of the clock synchronization system. The system consists of a master clock module and a number of clock modules, and the control chip is the use of C2000 microprocessor DSP series TMS320F28335. The clock module with constant temperature crystal, in contrast to more convenient, clock module selects the different parameters of OCXO. The synchronization signal between the master clock module and a plurality of school clock module uses optical transmission, one minute time synchronization. The actual test results of the system show that the time error between the master clock and the clock is less than ±2.5 μs when the system runs to the steady state.