Abstract: The radar has abundant electronic components and a complicated electricity supply system. In this essay, reduction voltage component has been considered in the foundation of current radar load model and a new pulse load, simulation method and a pulse load mathematic model have been put forward based on rectified buck converter, direct current switch, pulse load simplified by phased array radar. The effects of pulse load parameter duty cycle D, peak power PL and periodical TS changes has been analysed through simulation. The validity of simulation are verified by establishing experiment platform.