Abstract: Abstract: To optimize soil water management and tap the potential of carbon sequestration and emission reduction, a field controlled experiment was conducted to study the changing law of soil CH₄ flux in the crops root zone formed by the soil moisture status of different buried depth of drip irrigation pipe (0, 10, 20, 30 cm, i e. DI, SDI10, SDI20, SDI30), and its driving mechanism was analyzed. The results are showed as follows: (1) The effects of different buried depth of drip irrigation pipe on CH₄ flux were absorption. When the ‘plant+root+soil’ was used as the whole monitoring, it was found that the CH₄ accumulative absorption of SDI20 and SDI30 was 7.12 and 4.11 times (P<0.05) that of DI, respectively. Taking ‘root+soil’ as the object of monitoring, it was found that the CH₄ accumulative absorption of SDI10 and SDI20 were increased by 28.81% and 26.02% compared with that of DI (P<0.05). Therefore, the difference of soil moisture distribution and uniformity caused by the increase of buried depth of drip irrigation pipe had a significant regulation effect on soil CH₄ absorption; (2) The buried depth of drip irrigation pipe significantly affected the physical and chemical properties of soil in the root zone. For example, the soil NO₃^--N contents in SDI10, SDI20 and SDI30 were 2.21, 2.28 and 1.54 times (P<0.05) that of DI, respectively; the soil aerated porosity of 0-20 cm in SDI10 and SDI20 was significantly increased by 14.45% and 33.27% (P<0.05) than that of DI, respectively. The changes of soil physicochemical properties caused by the increase of the buried depth of drip irrigation pipe significantly increased the root forks number of tomato, enhanced ‘root-soil’ interaction, and formed conditions favorable for CH₄ oxidation. For example, SDI20 and SDI30 significantly increased the CH₄ oxidation genes copy number of K10944 (pmoA-amoA), K10945 (pmoB-amoB) and K10946 (pmoC-amoC), which was significantly positively correlated with the CH₄ accumulative absorption and the root forks number of tomato; (3) The path analysis of changes in CH₄ accumulative absorption showed that the CH₄ oxidation gene copy number was the main factor affecting the cumulative absorption of soil CH₄, and the variation in the root forks number of tomato (R=0.77) and NH₄⁺-N (R=0.42) caused by the changes of buried depth of drip irrigation pipe had a significant direct regulatory effect on CH₄ oxidation gene. In addition, it was also found that the fresh leaf weight (R=0.41) during the fruit expansion stage also had a significant direct effect on the cumulative absorption of CH₄, indicating that the tomato plants participated in the CH₄ exchange between the atmosphere and soil. In general, SDI20 and SDI3 enhanced the ‘plant-root-soil’ interaction and promoted soil CH₄ absorption by increasing the root forks number of tomato, the CH₄ oxidation genes copy number and the fresh leaf weight during the fruit expansion stage; DI and SDI10 relatively weakened the ‘plant-root-soil’ interaction and inhibited soil CH₄ absorption. This study suggests that different buried depth of drip irrigation pipe modulate the ‘root-soil’ interaction and the cumulative absorption of soil CH₄ by shaping soil moisture distribution and uniformity and plant growth differences.