English：

in the drainage system of pumped storage powerstation. However, little information has been published on efficient and coordinated materialtransportation for TBM in tunnel characterized by small diameters, tight curves, multiple bends, and longdistances in these drainage systems. As one of the critical factors influencing TBM construction, efficientmaterial transportation systems are compared based on practical application effects in completed pumpedstorage power station projects utilizing small⁃diameter TBM in drainage systems. This comparative analysisexamines the adaptability and efficiency of track⁃based transportation, trackless transportation, andcontinuous conveyor system, ultimately summarizing the selection of matching efficient materialtransportation systems for small⁃diameter TBM application in drainage systems under varying conditions.Although the use of a single transportation method is feasible considering various on⁃site constraints, acombination of two or more methods mayyield optimal results.