The　tests　were　implemented　in　low　strength　concrete　with　four　kinds　of　strength　(C20,　C25,　C30,　C35)　and　with　diffrent　strain　ratses　(10(-5/s-1),　10(-4/s-1),　10(-3/s-1)　and　10(-2/s-1)).　The　stress-strain　curves,　strength,　elastic　modulus　and　Poisson＇s　ratio　are　studied　in　different　strain　rate.　The　results　show　that:　(1)　With　the　increase　of　strain　rate,　the　inflexion　strength　and　ultimate　strength　of　concrete　were　improved;　(2)　With　the　increase　of　strain　rate,　the　static　and　dynamic　elastic　modulus　increased　slightly;　(3)　Poisson＇s　ratio　increased　slightly　with　the　growth　strain　rate.　This　conclusion　is　very　important　in　civil　engineering.　(C)　2011　Published　by　Elsevier　B.V.　Selection　and/or　peer-review　under　responsibility　of　the　Organising　Committee　of　The　International　Conference　of　Risk　and　Engineering　Management.