Stabilizer-treated　soil　possesses　unique　structures　due　to　the　cementation　of　soil　particles　and　cement-hydrate.　Compared　with　remolded　normally-consolidated　soil,　treated　soil　usually　holds　a　strong　structure　and　overconsolidation　ratio.　Treated　soil　exhibits　softening　behavior　due　to　the　loss　of　cementation　induced　by　the　decay　of　bonded　structure　during　the　development　of　deformation.　An　evolution　rule　of　cementation　effect　is　proposed　to　consider　the　change　of　cementation　strength　with　shear　strain.　The　hardening　parameter　in　UH　model　is　modified　and　an　elastoplastic　constitutive　model　incorporating　cementation　effect　for　stabilizer-treated　soils　is　proposed,　in　which　non-associated　flow　rule　is　used.　The　comparison　between　predicted　mechanical　behaviors　of　cement-treated　soil　and　lime-treated　soil　with　triaxial　compression　test　results　indicate　the　validation　and　accuracy　of　the　proposed　model.　Consideration　of　the　contribution　of　cementation　effect　can　describe　the　mechanical　behaviors　of　stabilizer-treated　soils.　The　soil　behaves　like　overconsolidated　soil　due　to　the　cementation　strength,　while　the　softening　is　faster　with　the　decrease　of　cementation　strength　during　deformation.　©　2018,　Science　Press.　All　right　reserved.