Water Infiltration Causes: {0) Screw holes not tightly sealed, leaving voids or cracks; {1) Sealing material shrank and cracked, losing waterproofing effectiveness; {2) Concrete around the screw was not properly vibrated, resulting in honeycombing and surface defects; {3) Poor bonding between the water-stop flange and concrete, creating a path for leakage. Solutions: {4) Use micro-expansion waterproof mortar to seal, ensuring tight filling; {5) Clean debris from the hole before sealing and apply an interface agent to enhance adhesion; {6) Seal in two stages: first fill to the middle of the wall, then fill to the surface, with an interval of 24 hours between each stage; {8) Conduct a water spray test after sealing and repair any leaks immediately; {9) Apply waterproof coating on the exterior side to create a secondary waterproof barrier. Strictly following these construction procedures will effectively eliminate water infiltration issues.