To investigate the interaction mechanism between expansive soil slopes under wetting-induced deformation conditions and soil nailing with flexible facing structures, aiming to provide references for the design of reinforcement structures for expansive soil slopes.Through a 1:20 scale laboratory model test, the expansive soil with medium swelling potential from Baise, Guangxi was compacted in layers to form a model slope. Soil nailing with a flexible facing system and monitoring elements were ins