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As a new class of switching devices,Photoconductive semiconductor switches (PCSS's)are a combination of ultra-fast pulsed laser and photoconductor,it possesses a broad application prospect in the fields of superspeed electronics,generation of high power electrical pulses,fine-synchronization control and terahertz technology.The transient built-in field in the photoconductor of the nonlingear GaAs PCSS's is studied by simulation method.According to the GaAs optical characteristic,the transient optical characteristics are explored based on the transient built-in field and the transient photogenerated carries distribution.The result shows that there are not only an intense nonuniform electrical characteristic but also an intense nonuniform optical characteristic.