The use of "carbonized wood" is divided into two categories: indoor use and outdoor use. Indoor use is mainly used for: floors, wall panels, interior decoration, furniture, doors and windows, blinds, window sills, sauna room floors and wooden structures, etc. Especially in the new residential buildings in northern my country, there are more and more ground heating floors. Too many cannot use solid wood flooring because of the unfavorable dimensional stability, and only laminate flooring or multi-layer solid wood composite flooring can be used. In the environment of floor heating, the release of formaldehyde from the adhesive layer of reinforced and composite floors causes indoor air pollution, which is a very difficult problem. The carbonized wood has good size performance and no air pollution, so it can be used for floor heating.