Abstract: Based on the fast semiconductor switch with high voltage and high power, PFN and the technology of the concentric and sameness space transfer, a modularity fast pulse trigger with many channels in-phase was designed. The above pulse trigger with a load of 50 can export two fast pulse trigger signals that is one signal with more than 20 V output voltage (four channels), less than 820 ps fall time, more than100 ns pulse width and another signal with more than 100 V output voltage (four channels), less than 1.4 ns fall time, more than100 ns pulse width, and with the exterior trigger, the jitter of the pulse trigger achieves 2 ns and the in-phase decentralization character of the pulse output achieves 36.6 ps. The experiment results of single exterior trigger and exterior trigger with 5 kHz repetitive frequency for the above modularity fast pulse trigger were given, and the experiment result validates the theory and method of the concentric and sameness space transfer.