The thermal wood treatment is a rather serious process. The structure and chemical composition of wood is changed in this process. Naturally each species of trees reacts differently on the influence. Different structure of fiber, content of resin and moisture are the most important factors of obtaining the quality thermal wood. Any species of wood can be processed but the material which is really quality and resistant to external effects can be only from certain species of trees. Other species either are used at a certain extent for obtaining thermal wood or are not used at all. During multi-year researches Europeans selected some tree species which are suitable for thermal treatment. We learn from that invaluable experience and offer the quality thermal wood from the following species.