The realization technique of fast linear transformer driver on the compact modularized high power pulse generator was expounded. The influence on Modular amount and the output quality of fast linear transformer driver (FLTD) was analyzed. The limitation on FLTD primary inductance was reduced by optioned feeding structure. The waveform distortion was weakened by designed back swing coil. Through engineering experiments, electron beam closed 0.8MeV with repetition frequency of 25 Hz and top time of ~80 ns were obtained. So this paper gave a new idea for research on the modularization compact high power pulse generator with higher repetition rate.