Abstract: Maths model of nonlinear electric pulse generated by PCSS's is built. Transmission Characteristics of various waveforms of it are deduced theoretically and analysised numerically. Compared with rectangle and isosceles trapezoid electric pulses,it is indicated that transmission Characteristics of Nonlinear Electric Pulse is more closer to that of rectangle pulse,when the risetime is shorter and the beeline is more horizontal. Theoretical basis is provided for applications of nonlinear photoconductive switches in the transmission of electromagnetic energy.