Abstract:To explore the floristic characteristics of seed plants in Yaoshan National Nature Reserve, the flora was investigated and analyzed. The results indicated that there were 1978 species of seed plants in Yaoshan, which belong to 698 genera in 132 families. Among them there were 5 families, 8 genera, 10 species in gymnosperm; 127 families, 690 genera, 1968 species in angiosperm. At family level, the proportion of the tropic elements was slightly higher than others and reached 53.57% and the temperate ones accounted for 44.05%. While at genus level, the temperate elements (69.76%) had obvious advantages compared with tropic ones (25.76%), reflecting the transitional characteristics form tropic to temperate of this region. Twenty-eight genera were endemic to China containing 11 woody genera, such as Ginkgo, Eucommia and Cyclocarya, et al. And genus consisting of only 1 species or few species accounted for 87.25%, among which 45 were monomorphic genera, suggesting the ancientness of this flora. The flora of Yaoshan and neighboring areas (Baotianman Mountain, Jigong Mountain and Tianmu Mountain) all showed temperate characteristics, and Yaoshan has the highest proportion of temperate components. On the whole, the Yaoshan shows obvious temperate characteristics, and the origin of the flora is mainly East China, and it is infiltrated by North and Central China. To sum up, the study would provided scientific basis for the sustainable utilization of plant resources, the assessment and protection of rare and endangered plants in Yaoshan area.