Abstract: The analytic expression of the purely resistive load output voltage is derived by using the Laplace transform to solve the process that a two-stage coaxial Blumlein line discharges a resistive load. The influence of switch inductance, resistive load inductance and loop inductance on the resistive load main pulse is analyzed. Comparing the result simulated by PSpice with the suppositional expression of load voltage, we find they fit well. The result indicates that the pulse rising time is mainly determined by switch inductance and the trend of the flat part is mainly determined by loop inductance .The smaller the switch inductance is, the less the rising time is; the larger the loop inductance is, the higher the pulse voltage and the energy efficiency are. The conclusion is significant to the design of two-stage coaxial Blumlein lines.