Abstract: [Objective] The study amisto analyze the effects of 5BB, SO4 and 101-14MG on the photosynthesis of Cabernet Sauvignon leaves, and provide the scientific basis for the utilization and improvement of the photosynthesis of Cabernet Sauvignon 9.[Method]Taking Cabernet Sauvignon 9/5BB, Cabernet Sauvignon 9/101-14MG, Cabernet Sauvignon 9/SO4 and Cabernet Sauvignon 9 as test materials to determine of relative chlorophyll content by SPAD502, the leaf area by CID CI-202, and measure the photosynthetic parameters by TPS-2 photosynthesis apparatus.The effects of 3 rootstocks on leaf quality and photosynthesis of Cabernet Sauvignon 9 were analyzed.[Result]Cabernet Sauvignon 9/5BB increased leaf weight significantly compared with Cabernet Sauvignon 9 own-rooted tree,the leaf area also increased, the specific leaf weight increased by 21.4;, 36.8; and 35;, respectively;The SPAD value of Cabernet Sauvignon 9/101MG leaves was significantly lower than that of others;The dark respiration rate of Cabernet Sauvignon 9/101-14MG was significantly lower than that of Cabernet Sauvignon 9;Cabernet Sauvignon 9/5BB and Cabernet Sauvignon 9/SO4 had a larger light range, 2,196 μmol/(m2·s) and 2,157 μmol/(m2·s), respectively;The maximum net photosynthetic rate of Cabernet Sauvignon 9/5BB was 14.7 μmol/(m2·s), which was higher than that of other treatments;The utilization ratio of light energy of Cabernet Sauvignon 9/SO4 and Cabernet Sauvignon 9/101-14MG was higher than that of Cabernet Sauvignon 9/5BB;The light utilization index of Cabernet Sauvignon 9 was significantly lower than that of 3 rootstocks.[Conclusion]Rootstock 5BB significantly improved the leaf quality of scion variety Cabernet Sauvignon 9;SO4 slightly reduced the leaf area, 101-14MG reduced chlorophyll content.In line with this, the stock 5BB enhanced the net photosynthetic rate of the 9th leaf of Cabernet Sauvignon.The ability to resist strong light and weak light was improved, photosynthetic potential was enhanced, SO4 had no significant effect on photosynthesis of Cabernet Sauvignon 9th leaves, 101-14MG reduced photosynthesis of scion Cabernet Sauvignon 9th leaves, but from the perspective of light energy utilization, it is beneficial to the photosynthesis of Cabernet Sauvignon 9th leaves.