When wood raw materials are increasingly scarce, how to make good use of surplus materials and waste recycling will become one of the keys to the competition in the wood product market. In addition, the primary process of residual waste is "planing parallel to the reference plane". Only by providing materials with a flat and equal thickness can the follow-up process be effective. In view of this, the development of ultra-short material double surface planer (100MM, has become a duty-bound thing). -GT-400S- has a number of special mechanisms, which overcome the difficulties of planing short materials one by one. The operation mode that can be used for both long and short is also designed to make it play a wider range of performance.