This　paper　develops　a　modeling　method　with　an　incremental　stress-strain-environment　constitutive　model　to　predict　the　change　in　the　plastic　mechanical　behavior　of　concrete　caused　by　environmental　action.　The　model　regards　the　environmental　factor　as　a　constitutive　variable,　similar　to　stress　and　strain.　The　yield　condition　of　the　model　is　a　function　of　stress,　the　plastic　internal　variable,　and　the　environmental　variable.　The　loading-unloading　criterion　is　established　in　the　space　constructed　by　the　strain　and　the　environmental　variable　to　determine　the　contribution　of　mechanical　loads　and　environmental　factors　to　plastic　deformation.　By　considering　the　strain　rate　as　an　environmental　factor　and　applying　the　proposed　method,　a　stress-strain-strain　rate　constitutive　model　of　concrete　is　developed　to　describe　the　plastic　flow　caused　by　the　combined　action　of　stress　and　strain　rate.　In　addition,　constant-　and　variable-strain　rate　loading　tests　are　performed　to　evaluate　the　performance　of　the　established　model.　In　particular,　the　model＇s　capabilities　are　further　highlighted　by　comparing　the　simulation　results　of　the　dynamic　stress-strain　model　and　the　proposed　model　under　loading　conditions　with　rapidly　decreasing　strain　rates.