Abstract:
The results of research shows that the net photosynthetic rate(Pn)，stomatal conductance(Gs)，intracellular concentration of C02(Ci)，Ch1．a and Chi．b content，Chi．a／b and RubisCO content in grape leaves are decreased under high humidity and low light intensity．Both stomatal conductance(Gs)，intracellular concentration of CO2(Ci)and RubisCO content are significantly positive correlation with the net photosynthetic rate(Pn)(r=0．9772，r=0．9151，r=0．9101)．During the recovery，under slightly high humidity in combination with low light intensity，Pn，Ci，Gs and RubisCO content almost reach their values similar to the contrast level respectively．Using higher humidity in comb ination with lower light intensity，their values could not be recovered．

Key words: Grape, High humidity under low light, Photosynthesis, RubisCO content