Elm: Elm, also known as spring elm and white elm, is a deciduous tree of Ulmaceae. It is distributed in the northeast, north, northwest and southwest provinces of China, and is born on slopes, valleys, hills and sand mountains below the altitude of 1000 to 2500m.

Cedar: Cedar of Cupressaceae is an evergreen tree, which is widely distributed in China, from Inner Mongolia and Jilin in the north to Guangdong and Guangxi in the south. It has been cultivated many times all over the country and is an excellent landscaping tree species.

Pine: There are more than 80 kinds of pine trees in the world, which are not only numerous, but also widely distributed, such as Pinus tabulaeformis and Pinus sylvestris var. mongolica. Pinus sylvestris var. mongolica, Pinus thunbergii and Pinus densiflora distributed in several provinces of North China and Northwest China, Pinus massoniana, Pinus taiwanensis and Pinus alpine in several provinces of Central China, Pinus Bashan in Qinba Mountain area, Pinus Taiwan Province Province and Pinus brevifolia in North America. Most of them are the main tree species for afforestation in barren hills in China.