Due to the use of wood processing, the plane area is large, and the fixed point is less, so it is one of the most prone to deformation and cracking of decorative wood. The high moisture content of wood is also another main reason for the deformation of wooden doors, with the reduction of moisture content in the process of use, the internal stress of the wood will slowly reveal, and eventually lead to deformation and cracking. Since the deformed wooden door will directly lead to the sound insulation, tightness and beauty of the house, understanding the cause of the deformation of the wooden door has become a particularly important decorative knowledge before decoration.

Natural wood has various factors in the growth process, resulting in uneven density of wood (sunny side, density of annual rings, core and sapwood), when the wood is planed, it changes the balance of internal stress, causing the wood to deform and crack.