Introduction to plant resources: There are 1,272 species of vascular plants in 104 families, 424 genera and 104 families, among which Asteraceae, Rosaceae, Gramineae and Leguminosae are the most abundant. In deep valleys and steep slopes, a small amount of the only virgin forest in North China is preserved, while in the surrounding mountains, it is all secondary vegetation. There are 222 species of woody plants, among which the forest trees of Betula, Pinus, Larix, Picea, Quercus and Poplar are the most numerous.