The electronic performance of composite is different from that of aluminum and titanium, and it is anisotropic. The effective conductance for composite is less than that of the metal. The large size aircraft panel made from composite will reduce greatly the the shielding and conducting capacities of the skin to insulate the exterior electromagnetic wave. Composite integral tank is different from metal material in lightning protection, electrostatic protection, charge conduction and electromagnetic protection devices in fuel tank. It has special design requirements and schemes.