The lightning protection design and verification of aircraft is a necessary measure to ensure the safety of pilots and aircraft, especially with the poor lightning protection ability of composite materials. The conductivity of the composite is much weaker than that of the metal, which needs to provide additional pathways for the lightning current conduction. Based on the electromagnetic modeling of aircraft internal structure rarely mentioned in domestic related research, this paper proposes a set of electromagnetic modeling and precision control method for aircraft internal structure, constructs the internal metal structure from left wing to right wing of F22 aircraft as lightning current conduction path, and simulates the indirect effect of aircraft lightning based on general electromagnetic simulation software. The simulation results of electromagnetic field and cable coupling in aircraft interior under three conditions of composite skin, metal mesh skin, metal mesh skin and internal metal structure are compared. After evaluation, reasonable lightning current conduction path design can reduce the current intensity induced by the cable inside the aircraft by half, and play a good lightning protection expected effect.