In the underdeveloped stage in the past, it was very common to carve seals with wood, mainly because the price was close to the people. First, choose wood, such as apricot and pear, which is delicate and hard. After grinding, write the content to be engraved upside down, and then remove the blank parts except the reservation. Generally, cutting knives and planing knives are needed to deepen the depth, and of course, fixing fixtures are also essential. Sculpture is a process of practical accumulation.