Circulating　flow　characteristics　are　typical　characteristics　of　dilatant　sands　in　liquefaction　stage.　In　order　to　study　the　dynamic　shear　behavior　of　liquefied　circulating　soils,　fine　particles　of　different　contents　were　added　to　sandy　soils　with　skeleton　relative　densities　of　35%,　50%　and　80%　respectively,　for　the　purpose　of　changing　the　gravity　of　liquefied　flowing　soils.　The　variations　of　shear　modulus　and　damping　ratio　of　liquefied　flowing　soils　with　different　skeleton　densities　and　different　contents　of　fines　in　large　deformation　stage　were　studied　by　cyclic　torsional　shear　test.　The　test　results　show　that　the　liquefaction　circulating　flow　soil　still　has　a　certain　modulus　in　the　stage　of　large　deformation,　and　the　modulus　decreases　gradually　with　the　increase　of　strain;　the　modulus　at　the　stage　of　flow　deformation　is　basically　independent　of　the　weight　of　liquefied　soils;　the　modulus　at　the　stage　of　strength　recovery　is　closely　related　to　the　content　of　fines　and　the　relative　density　of　skeleton;　the　unloading　modulus　at　the　stage　of　large　liquefaction　deformation　tends　to　be　stable,　and　its　stability　value　is　about　35%　of　the　initial　unloading　modulus;　damping　ratio　increases　first　with　the　increase　of　shear　strain,　and　decreases　with　the　development　of　shear　strain　when　soil　reaches　initial　liquefaction.　For　soils　with　the　same　skeleton　density,　the　phase　transition　angle　decreases　with　the　increase　of　the　content　of　fines,　and　the　slope　of　critical　state　line　increases　with　the　increase　of　the　content　of　fines.　©　2020,　Editorial　Office　of　China　Civil　Engineering　Journal.　All　right　reserved.