The weight of honeycomb sandwich plate with the same stiffness is only 1 / 5 of that of aluminum plate and 1 / 10 of that of steel plate. The total thickness is 15 mm, the panel is 1.0 mm, the bottom plate is 0.8 mm aluminum honeycomb plate, and the weight is only 6 kg / m2. The interconnected honeycomb core is like countless I-beams, and the core layer is distributed and fixed in the whole plate