Abstract: The influence of the pulse forming network (PFN) with L-structure on the output waveform has been studied. The three-dimensional model of the pulsed forming network with L-structure has been established and simulated via finite integration software. The simulation results of the PFNs with two different structures have been compared. The pulse rise time of the PFN with the L-structure is about 40 ns, basically consistent with linear structure; the pulse half-high width is 168 ns, which is 7 ns smaller than that of the PFN with the linear structure; the flat-top of the output waveform fluctuates in comparison with the linear structure, which features the flat-top rise at the back part of the waveform. The simulation results have been verified by the high voltage experiment of the PFNs with the two different structures. For the compact engineering applications of the pulse driver source system, the output waveform of the PFN with L-structure could meet the requirements substantially.