This paper describes the design and construction of the production and transmission system of electron beams for "Heaven-I" preamplifier. To obtain lower voltage (400KV) and higher current density (143A× cm-2) for the optical aperture (f 12cm) and required laser output energy (40J) the diode feed bushing, electrode form, length of drift space, Hibachi open area, etc. are considered. The experiment results are given and the influence of the Marx voltage start time on electron beams energies is discussed for the fixed switch trigger time.