Abstract: The pulse forming line based on high dielectric constant ceramic dielectrics requires stacked Blumleins configuration with multi-switch triggering. Through the theory of pulse forming process, the effect of multiple switches dispersity of closure time on stacked Blumleins is analyzed, which contains two aspects: one is causing ladder distortions within rise and fall edges of the output rectangle pulse, the other is leading to over-voltage loaded on the parallel plate Blumleins triggered by the delayed closing switches, easily resulting in electric insulation failure for the ceramic dielectrics. A PSpice circuit program is utilized to simulate the effect on 4-stage stacked Blumleins, and the simulation results are in good agreement with analysis through the theory of pulse forming process. Practical solutions to the problem caused by the effect are presented.