High power pulse laser has important applications in precision welding and laser cleaning. Peak power increasing can be realized by beam combining of multiple pulse lasers, and the pulse synchronization accuracy significantly determines the performance of the beam combination laser. Therefore, we propose a pulse synchronization method based on programmable time modulation circuit with a maximum time delay of 256 ns and a resolution of less than 1 ns. It has been proved that the incoherent beam combination with 97% efficiency can be achieved by using this method for three independent sub-module lasers. When the synchronization is error less than or equal to 4 ns, the pulse repetition frequency and full width at half maximum can be adjusted in the range of 40?1000 kHz and 19?660 ns.