English：

Basement leakage is a prevalent issue throughout the entire life cycle of buildings, primarilydue to concrete cracking and degradation of waterproofing membranes. The spatial replacement andwaterproof layer reconstruction technology, characterized by its straightforward construction process, non⁃destructive nature to original structures, effective leakage sealing, and excellent durability, is widelyadopted in basement seepage control. This study investigates leakage issues in an existing basementthrough a practical engineering case, conducting diagnostic evaluations and analyzing the root causes ofseepage. By applying the spatial replacement and waterproof layer reconstruction technology, a multi⁃layered defense system is implemented in the seepage control. This approach successfully restores bothflexible and rigid waterproofing capabilities of the structure, resolves buoyancy resistance challenges inthe concrete slab, and significantly enhances the basement’ s seepage control effect, thereby ensuringstructural safety and long⁃term durability.