This paper introduces a fortification and restoration method for Geosynthetic Reinforced Soil(GRS) segmental retaining walls damaged by fire deterioration. A 7.6m high GRS retaining walls damaged by fire deterioration was considered in this case study. It was decided to reconstruct the uppermost portion of the GRS wall, hence, a 3.2m high section was excavated and a new wall was erected and filled with soil. During the construction, concerns were raised that if a building is to be constructed at the top of the wall, the wall probably fail due to tensile overstress and is feared to collapse. To solve this problem, soil nailing was applied, where long corrugated pipes were inserted onto the wall to increase the stability and prevent the facing to fail. Reinforced concrete was then poured at the front of facing to hold the corrugated soil nailing together. The project was successfully constructed without backfill excavation. This rehabilitation technique without backfill excavation is expected to be useful for damaged and collapsed walls.