Abstract: Photosynthetic characteristics of the leaves of the bloom ahead of The Spring Festival tree peony were studied comparatively with the CIRAS-1 photosynthetic instrument in solar greenhouse. The result showed that the photosynthetic rate、stomatal conductance and rising rate of leaves of depending on natural low temperature to completely relieves dormancy(Tree Peony ‘Rou Fu-rong’A and Tree Peony ‘Yin Hong-qiaodui’A)and were higher than these of traditional depend on drying root system and natural low temperature to relieves dormancy(Tree Peony ‘Rou Fu-rong’A and Tree Peony ‘Yin Hong-qiaodui’A). Between environmental CO2 concentration and photosynthetic available radiation, environmental CO2 concentration has the relative higher The grey correlation degree on factors that influence changes of photosynthetic rate in solar greenhouse.