Numerous　laboratory-based　solutions　have　been　proposed　in　the　recent　literature　for　the　stabilization　of　un-saturated　expansive　soil　by　recycling　lignosulphonate　(LS).　However,　the　practical　assessments　of　these　proposals　for　the　treatment　of　the　rainfall-induced　surficial　failure　in　unsaturated　expansive　soil　slopes　are　required,　considering　the　frequency　of　this　failure　and　associated　economic　loss.　Moreover,　in　conventional　geotechnical　practice,　the　slope　stability　is　generally　evaluated　only　with　consideration　of　the　hydraulic　response　of　the　soil,　ignoring　the　hydro-mechanical　coupling　effect　associated　with　the　swelling　behavior　of　soil.　Since　LS-based　stabilizers　mainly　impart　the　reduction　of　the　swelling　potential　of　expansive　soils,　the　assessment　of　the　sta-bility　of　the　LS-treated　surficial　layer　of　unsaturated　expansive　soil　slopes　requires　consideration　of　the　hydro-mechanical　effect.　For　this　purpose,　the　uncoupled　and　hydro-mechanical　coupled　analyses　were　conducted　for　dealing　with　the　hydraulic　and　hydro-mechanical　responses　of　the　surficial　layer　of　soil　slopes,　respectively.　Specialized　experimentations　and　pertinent　literature　review　were　performed　to　acquire　the　required　input　data　for　these　analyses.　It　is　observed　that　the　LS-based　surficial　layer　treatment　affects　the　pore　water　pressure　(PWP)　profiles　as　well　as　wetting　front　depth　(WFD),　which　are　the　critical　aspects　for　influencing　the　stability　of　un-saturated　expansive　soil　slopes.　Among　all　LS-based　stabilizers,　only　the　stabilizer　named　composite　cementing　admixture　(CCA)　reasonably　ameliorated　the　PWP　profiles　and　WFD　of　the　slope　considering　disastrous　envi-ronmental　impacts　(i.e.,　wetting-drying　cycles).　Moreover,　the　heave　problem　of　expansive　soil　slopes　was　observed　to　be　mitigated　by　LS-based　treatment　among　which　the　CCA　performed　the　most　efficiently.　Furthermore,　the　critical　factor　of　safety　(FS)　required　for　slope　stability　was　also　affected　by　the　LS-based　treatment,　whereas　the　CCA　was　observed　to　provide　the　safest　critical　FS　for　slope　stability.