In this paper, the generator of arbitrary shaping electrical pulse is realized successfully by using the voltage-controlled-current and on/off properties of GaAs field-effect transistor (FET). The waveform of the generated basic electrical pulse is the same as the trigger pulse, and the amplitude is dependent on the minus bias voltage. Each generated basic electrical pulse of all the basic circuits is independent on another, and this will make the computer-controlled arbitrary shaping electrical pulse generator possible.