Abstract: 【Objective】 To study the effects of different amounts of drip irrigation under mulch film on soil organic carbon of summer soybean in the hope of providing theoretical basis for high-yield and accumulation of soil organic carbon of summer soybean. 【Methods】 In this study, six amounts of drip irrigation under mulch film: 4,200 m³/hm² (W₀), 3,780 m³/hm²(W₁), 3,360 m³/hm²(W₂), 2,940 m³/hm² (W₃), 2,520 m³/hm²(W₄), 2,100 m³/hm² (W₅), and one no mulch treatment 4,200 m³/hm² (CK) were conducted in 2019.respectively to research the impacts of amounts of drip irrigation under mulch film on the contents of soil CO₂ respiration, soil total organic carbon (SOC)and soil carbon pool management index (CPMI) of summer soybean. 【Results】 The results showed that contents of soil CO₂ respiration of summer soybean in the measurement period followed the sequence of W₂>W₃>W₄>W₅>W₁>W₀, with no significant difference between W₂ and W₃ treatment (P<0.05).With the increasing irrigation volume, the variation of soil organic carbon content, soil active organic carbon content and soil carbon pool management index all increased first and then decreased, the indicators of W₂ or W₃ treatments were better than those of other treatments.The yields was the highest in W₃ treatment, which was 3,304.90 kg/hm², increased by 7.45%, 5.16%, 0.77%, 8.42% and 18.68% in comparing with that of W₀, W₁, W₂, W₄ and W₅.Besides, the plastic mulching treatments of each physiological indicators were higher than those of no mulching treatment (CK). 【Conclusion】 Therefore, 2,940-3,360 m³/hm² can increase the content of soil SOC and AOC in the tillage layer (0-30 cm) for high yield of summer soybean.