A method measuring timing synchronization of multi-beams laser for intertial confinement fusion (ICF) facility is proposed. Firstly, the time interval of reference laser beam arriving criterion point and target point is measured. Secondly, the time interval of reference laser beam arriving criterion point and measured laser beam arriving target point is measured, the D- value between these two intervals stand for the time synchronization difference between reference beam and measured beam arriving the same target point. The analysis shows that the precision of this method is 25.2 ps.The measurement technology is simple and efficient, and it has been successfully applied in the synchronization measurement of ICF laser facility.