Abstract: Objective: During the repair process of metro tunnel segments, the damaged lining segments are typically repaired by workers accessing the surface through an open excavation vertical work shaft and subsequently restoring the tunnel structure. However, when backfilling the shaft the law of load distribution on shield tunnel arch exerted by internal backfilling materials remains unclear. Therefore, it is necessary to study the backfilling materials sampled from tunnel damages for vertical shaft repair, as well as the load distribution law throughout vertical shaft backfilling process. Method: A finite element model of the shield tunnel vertical shaft repair and backfilling is established. Three types of backfilling materials: sand, lightweight concrete, and gravel soil, are selected for analyzing of the load transfer and distribution law during vertical shaft repair and backfilling. Result & Conclusion: When lightweight concrete is used as the vertical shaft backfilling material, the stress at shaft bottom is minimized. When its backfilling height reaches 17.4 m, the stress on shaft bottom is 55.58 kPa. The load exerted on tunnel arch crown throughout vertical shaft backfilling process is uniformly distributed. As the cumulative backfilling height in the vertical shaft increases, the load on shield tunnel arch crown increases exponentially. When the backfilling height in the vertical shaft exceeds 6.0 m, the growth of load on tunnel arch crown slows down and gradually becomes stable.