Synchronization measurement of multi-beams for high power laser facility is achieved at the same time. The time correlation and duplicate measurement method, temporal profile diagnostic module of tripled frequency, and the high-speed digital oscillograph and transient photodiode are used. The synchronization adjustment is obtained by arbitrary wave generator and optical delay cell of front end. Results show that the errors of the synchronization measurement are less than 30 ps. The measurement technology and methods are important for synchronization measurement of multi-beam laser facility.