Abstract: A sheet beam electron optics system for G-band sheet beam klystron was designed and analyzed. The voltage and current of the beam is 16.5 kV and 0.58 A respectively. The electron beam with a rectangle cross section of 2.5mm × 0.15mm is focused by uniform solenoidal magnetic field. In this paper, the transport process of the electron beam is simulated. Simulation results show that the electron beam transmission attained 100% over 15mm in distance.