Abstract: A new method of deflecting the space charged particle by bending crystal is proposed, to improve the mass efficiency of the traditional radiation shielding method. Four key parameters are discussed with regard to the deflecting mechanism of the bent crystal, i.e., the critical angle, the critical radius, the de-channeling length, and the deflecting efficiency. The calculation results show that the carbon nanotube material enjoys a better engineering value as compared with the silicon crystal. A type structure made of the bent carbon nanotube crystal is established for deflecting the simulated space isotropic charged particles in the Earth’s radiation belt. The shielding thickness required for effectively deflecting the electrons and protons of different energies is preliminarily studied. It is concluded that the deflection method can be well targeted to the electrons than the traditional method in the practical sense.