Abstract: The 954 species of seed plants distributed in the Gaogui Mountain were investigated statistically.The data presented that they were classed among 504 genera in 143 families,which indicated the diversity of the species of the Gaogui Mountain based on its location in the common boundary of Hubei and Henan,one of the representative regions of the temperate zone,with its endemic flora including archaic,relic,rare and endanger seed plants in the climatic transition zone,between South and North in China.So,the Gaogui Mountain may be a good place as a climatic transition zone to investigate the diversity of species distributed in from the Central to East China Areas.