Indoor retaining walls are structural elements used to support soil and prevent its movement. Treatment methods for indoor retaining walls typically include waterproofing, reinforcement, and proper drainage systems to ensure structural integrity and prevent soil erosion. Waterproofing involves the application of sealants or coatings to prevent water渗透. Reinforcement may involve the use of steel bars or mesh to strengthen the wall. Good drainage is essential to avoid hydrostatic pressure buildup that can lead to wall failure.