A divider-digital storage oscilloscope program is proposed to monitor variation of voltage signal on thyristor from triggered to conducting in pulsed power source. Establishing lumped parameter model of resistive divider and analyzing the degree of influence which stray inductance, stray capacitance and longitudinal capacitance caused on the low-voltage output waveform amplitude、response time、phase error, then set a simulation by PSPICE to analyze the result, the new divider was developed by using glass enamel film resistor according to the result of analysis, and the voltage signal generated from capacitive Pulse Power Source is in great agreement with the new divider after theoretical analysis and experimental verification.