Isotropically　consolidated　undrained　triaxial　compression　shear　tests　are　performed　on　both　undisturbed　and　remolded　Fuzhou　clays　to　compare　their　difference　in　mechanical　behavior　caused　by　soil　structure.　It　is　understood　that　the　strength　behavior　of　natural　clays　can　be　classified　into　three　regimes:　(a)　the　pre-yield　regime,　in　which　the　undrained　shear　strength　is　controlled　mainly　by　soil　structure;　(b)　the　transitional　regime,　in　which　the　strength　behavior　is　affected　by　both　soil　structure　and　stress　level,　and　it　gradually　coincides　with　that　of　the　remolded　specimens　as　the　soil　structure　gradually　damages　with　the　increase　in　applied　stress;　(c)　the　destructured　regime,　in　which　the　strength　behavior　becomes　the　same　as　that　of　the　remolded　specimens.