To　explore　the　mechanical　properties　of　seawater　sea　sand　recycled　aggregate　concrete　(SSRAC),　SSRAC　prisms　were　designed　with　different　mix　proportions.　The　complete　stress-strain　curves　were　tested　under　uniaxial　compression　with　the　strain　rates　of　10-5　s-1　and　10-2　s-1.　Failure　modes　of　specimens　and　the　peak　stress,　strain　at　peak　stress　and　elastic　modulus　were　analyzed.　And　the　effects　of　the　strain　rate,　replacement　ratio　of　recycled　coarse　aggregate　(RCA)　and　shell　particle　contents　on　the　above　indices　as　well　as　the　dynamic　increase　factor　(DIF)　were　discussed.　Meanwhile,　the　pore　distribution　of　SSRAC　from　computed　tomography　(CT)　tests　was　used　to　explain　the　development　of　characteristic　indices　of　stress-strain　curves.　Finally,　based　on　the　existing　uniaxial　compression　constitutive　models　of　RAC,　the　predicted　complete　stress-strain　curve　was　obtained　by　taking　the　DIF　of　characteristic　indices　and　the　modified　shape　factor　of　descending　branch　into　account.　©　2021,　Editorial　Department　of　Journal　of　Tongji　University.　All　right　reserved.