In　order　to　explore　the　mechanical　properties　of　undisturbed　sea　sand　concrete　with　high　chlorine　concentration　and　high　shell　content,　taking　the　chloride　ion　content　and　shell　content　of　sea　sand　as　variables,　nine　groups　of　sea　sand　concrete　were　designed　and　prepared　to　carry　out　concrete　cube　compressive　strength　test　and　uniaxial　compressive　stress-strain　curve　test,　and　compared　with　ordinary　concrete.　The　results　show　that　with　the　increase　of　chloride　ion　content,　the　pore　structure　of　concrete　becomes　finer,　the　early　strength　increases,　the　peak　stress　of　uniaxial　compressive　stress-strain　complete　curve　increases,　the　peak　strain　decreases,　and　the　elastic　modulus　increases.　With　the　increase　of　shell　content,　the　slump　of　concrete　decreases　significantly,　the　pore　structure　of　concrete　becomes　looser,　the　strength　decreases,　and　the　peak　stress　of　uniaxial　compressive　stress-strain　complete　curve　decreases,　the　peak　strain　increases,　and　the　elastic　modulus　decreases.　Finally,　based　on　the　existing　models,　the　formula　for　calculating　the　model　parameters　of　chloride　ion　content　and　shell　content　is　put　forward.　©　2024　Bulletin　of　the　Chinese　Ceramic　Society　Press.　All　rights　reserved.