Abstract:In order to explore the physiological mechanism of postphloem sugar transport in fruit of Ziziphus jujuba Mill cv.Lingwuchangzao, in this study, the different developmental periods fruits were selected as materials to study effects of carrier inhibitor PCMBS and ATPase inhibitors (EB, DNP, NO3-) on the uptake14C-glucose and14C-sucrose in the phloem nonvascular bundle area. The results indicated that in slow growth period S1, the first rapid growth period R1 and the second rapid growth period R2, PCMBS and ATPase inhibitors significantly inhibited the absorption of14C-glucose in fruit,but the inhibition was not obvious in slow growth period S2.The capabilities of14C-glucose transmembrane transport into vacuole followed the order of R2> S1> R1> S2. In the second rapid growth period R2 and the slow growth period S3, PCMBS and ATPase inhibitors markedly affected the uptake of14C-sucrose in fruit, but the inhibition extents are different in different developmental periods, so the capabilities of fruit accumulation14C-sucrose across the plasma membrane and tonoplast were all strong in R2 and S3. To sum up there existed a active transport sugar process that need carrier-mediated and energy-dependent after unloading sugars in Lingwuchangzao fruit in S1,R1,R2 and S3, the active and passive transport existed simultaneously in sugar transportation process of fruit in S2.The study provide scientific bases of fruit sugar accumulation and quality regulation for Ziziphus jujuba Mill cv. Lingwuchangzao.