Abstract: As a high voltage and high power pulse source, MARX generator has been applied to some domains. First, the performance of typical MARX generator is compared with the performance of usual high voltage pulse modulators. MARX generator is valuable for application in pulse radar transmitter. Then, the circuit of inductor isolation MARX generator is analyzed in detail, the operating state of the circuit is discussed when the pulse width and the repetition frequency are changed, optimizing working mode is given when the circuit is applied in pulse radar transmitter. Finally, a try at an X-band intermediate frequency coherent pulse Doppler weather radar transmitter is made, and the result is satisfactory.