A　test　of　the　uniaxial　compressive　stress-strain　curve　under　different　strain　rates　was　carried　out　on　seawater　and　sea　sand　recycled　aggregate　concrete（SSRAC）considering　different　ages　and　shell　contents.　The　results　show　that　the　600　d　peak　stress　and　peak　strain　of　SSRAC　increase　by　10.4%　and　23.2%，respectively，as　compared　with　those　of　natural　aggregate　concrete（NAC）.　However，the　elastic　modulus　of　SSRAC　decreases　by　29.1%.　The　strain　rate　sensitivity　of　SSRAC　increases　with　the　increase　in　shell　content.　Then，based　on　the　model　in　GB50010，a　dynamic　constitutive　model　is　proposed　for　SSRAC　under　medium　and　low　strain　rates（from　10-5　s-1　to　10-1　s-1）considering　the　dynamic　increase　factor　of　characteristic　parameters.　Finally，mechanism　analyses　of　the　characteristic　of　its　stress-strain　curves　are　given.　©　2024　Tongji　University.　All　rights　reserved.