Here,　introducing　multi-axis　effective　hardening　function　and　S-type　rate　correlation　strength　criterion,　the　concrete　damage　plasticity　(CDP)　model　was　improved,　and　known　as　S-CDP　model.　This　model　could　more　reasonably　reflect　the　strain　rate　effect　and　3D　plastic　deformation　behavior　of　concrete　materials.　Based　on　S-CDP　model,　the　rate　correlation　numerical　model　for　Dagangshan　arch　dam　was　established.　The　established　rate　correlation　numerical　model　was　used　to　analyze　strain　rate　distribution　law,　dynamic　growth　factor　(DIF)　variation　law　and　effects　of　concrete　strain　rate　effect　on　dynamic　responses　of　dam　body　under　earthquake　action.　The　results　showed　that　S-CDP　model　can　reasonably　reflect　rate　effect　of　concrete　material　in　tensile　zone;　under　seismic　loads　of　peak　ground　acceleration　(PGA)　=　0.　551　g,　0.　663g,　and　0.　836g,　respectively,　dynamic　strengths　of　arch　dam　body　concrete　can　increase　by　up　to　23%,　but　this　model　can＇　t　guarantee　dynamic　strength　of　dam　body　concrete　always　increasing　by　20%　or　more;　in　aseismic　design　of　hydraulic　structures,　if　dynamic　strength　of　concrete　increases　by　a　fixed　20%,　it　may　cause　deviations　between　calculated　damage　results　and　actual　damage　results;　damage　results　calculated　through　increasing　dynamic　strength　by　a　fixed　20%　are　larger　than　those　calculated　using　S-CDP　model　here;　in　aseismic　design　of　hydraulic　structures,　it　is　recommended　to　choose　appropriate　concrete　rate　correlation　constitutive　model　for　calculation　so　as　to　ensure　calculation　accuracy　as　much　as　possible.　©　2023　Chinese　Vibration　Engineering　Society.　All　rights　reserved.