Abstract: The Song Mountain,Jigong Mountain and Tianmu Mountain,situated in the middle and south parts of Henan province in China.On basis of comparison research carried out for the flora of Song,Jigong and Tianmu Mountain,we make use of a mathematic model to calculate comparability coefficient.Study result shows that there exists some difference between the flora of Song Mountain and that of Jigong Mountain and Tianmu Mountain.Song Mountain gives first place to temperate zone component closely related to that in Nor...