Abstract: 【Objective】 To evaluate the effects of Zhongai-1, Zhongai-2, Zhongai-3 and Duli on photosynthetic and fluorescence characteristics of Korla fragrant pear in the hope of providing a theoretical basis for choosing suitable dwarfing interstocks to close planting cultivation of Korla fragrant pear. 【Methods】 The photosynthesis and fluorescence parameters of four different dwarfing interstock Korla fragrant pear leaves were measured by using the Li-6400 photosynthesis apparatus and FMS-2 pulse modulation fluorescence instrument, and the differences were analyzed. 【Results】 The daily changes of Pn of Korla fragrant pears with different dwarfing interstocks showed a double peak curve, and there was an obvious photosynthetic "noon break" phenomenon, which was caused by non-stomatal limiting factors; The daily mean values of Pn and WUE of Zhongai 1 were higher than those of the other three interstocks; Different dwarfing interstocks had no significant effect on the Gs of Korla fragrant pear; ΦPSⅡ, CNPQ, ETR , Fm, Fv/Fo values of Zhongai 1 were the highest; Different dwarfing interstocks had no significant effect on the Cqp, Fv/Fm values of Korla fragrant pears. 【Conclusion】 From the perspective of photosynthesis and chlorophyll fluorescence characteristics, Zhongai 1 as the interstock of Korla fragrant pear is superior to the other two dwarfing interstocks and Duli, which can be considered as an excellent interstock of Korla fragrant pear.