Plywood is one of the commonly used furniture materials. It is one of the three main wood based panels. It can also be used for aircraft, ships, trains, automobiles, buildings and packing boxes. A group of veneers is usually glued to each other perpendicular to the grain direction of adjacent layers, and the surface and inner layers are usually symmetrically arranged on both sides of the central layer or core. The slab is made of glued veneer in the direction of wood grain and pressed under heating or not. The number of layers is generally odd, and a few even. The differences of physical and mechanical properties in the vertical and horizontal directions are small. Commonly used plywood types are plywood, plywood, etc. Plywood can improve the utilization rate of wood, which is a main way to save wood.