Aircraft is more light than usual because of using the material of carbon fiber, which can make aircraft lighter than metal materials. But the shielding effectiveness of carbon fiber is worse than metal materials. First, This paper explains the direct effect and the indirect effect which aircraft suffer of the lightning strike. And then this paper analysis and imitates the carbon fiber cabin struck by lightning. And then, at two circumstance of indirect effect, this paper gives the result of electric field, magnetic field and surface current. Finally, this paper gives some advice for defending outside the carbon fiber cabin and electromagnetic compatibility (EMC) inside the carbon fiber cabin.