Abstract: In this paper, we measured the light response curves of two ginkgo variants under different temperature, which were two-year old grafted ginkgo plants including the yellow and green genotypes collected from the two branches of the same tree, and then fitted those curves by four common models(the rectangular hyperbola model, the nonrectangular hyperbola model, the exponential model and the modified rectangular hyperbola model). It revealed that rectangular hyperbolic model was the best model to fit ginkgo’s light response curve. Meanwhile, we compared photosynthetic parameters of those two grafted ginkgos under different temperature. It was revealed that the values of light saturation point and maximum net photosynthetic rate(P_n,max)in yellow-leaf grafted ginkgo were significantly lower than yellow-leaf grafted ginkgo under same temperature, while apparent quantum yield(Φ), dark respiration rate(R_D)and light compensation point dropped significantly when temperature was above threshold value and threshold values of yellow ginkgo(≥28 ℃ in April and ≥38 ℃ in July)were lower than green ginkgo(≥30 ℃ in April and ≥40 ℃ in July). Based on the results, we provided a reference for the future study on ginkgo’s light response curve under difference stresses. Meanwhile, the upper temperature of these two kinds of ginkgo was a theoretical basis for establishing cultivation and management measure of yellow-leaf grafted ginkgo.