Chinese fir wood can be divided into two categories: coniferous wood and hardwood wood. Chinese fir and all kinds of pine, spruce and fir are coniferous trees; Oak, fraxinus mandshurica, cinnamomum camphora, sassafras and various birch, nanmu and poplar are hardwood. There are many tree species in China, so the wood species commonly used in engineering are different in different regions. In Northeast China, there are mainly Korean pine, larch (yellow pine), fish scale spruce, red bark spruce and ash; There are mainly Chinese fir and masson pine in the Yangtze River basin; The southwest and northwest regions mainly include fir, spruce and hemlock.