▎ 摘　　要

NOVELTY - The method involves measuring an actual electromagnetic radiation intensity value of a power supply system in a field environment. An electromagnetic environment exposure control limit value and a pressure-proof force limit value of the power system are set. An actual protection value of an electromagnetic protection layer is set to an electromagnetic wave absorption performance. A multi-level structure of the electromagnetic shielding layer is determined. A protection value is set. A power supply box is placed in an outer shell for sealing and protecting after finishing setting. USE - Electromagnetic protection method based on multi-source field power supply system used in land army field electromagnetic protection field for controlling modern information technology and scientific and cultural knowledge. ADVANTAGE - The method has prolonged service life and good electromagnetic protection capability; improved electromagnetic shielding ability of the electromagnetic shielding layer. The graphene and magnetic particles have good synergistic effect, so that the magnetic consumption and dielectric loss can be attenuated and weakened electromagnetic wave and the presence of magnetic loss in the field environment can be avoided. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the internal structure of electromagnetically protecting method based on multi-source field power supply system used in land army field electromagnetic protection field for controlling modern information.