Abstract: The radiation belt particles are the main source of the total dose radiation for satellites in near-Earth orbits. The characteristics of the radiation environment on different orbits of the inner radiation belt are analyzed, and the shielding capabilities of several materials against the protons of the inner radiation belt are compared by using the Geant4 code. It is shown that although the low-Z/high-Z/low-Z sandwich shielding structure has a better shielding effect for electrons, it is not suitable for the proton-dominated orbits. For satellites operating on the 3000 km circular orbit and with a designed lifetime of five years, the pure PE shielding can be used to reduce the total dose below 30 krad(Si), with the weight reduces by 28% as compared to Al shielding.