Phosphated　hydrotalcite　(P-LDHs)　was　synthesized　from　steel　slag　and　modified　hydrotalcite　(SDS-P-LDHs)　was　obtained　by　intercalation　of　P-LDHs　with　sodium　dodecyl　sulfate　(SDS).　P-LDHs　and　SDS-P-LDHs　were　blended　with　expanded　graphite　and　ethylene　vinyl　acetate　copolymer　(EVA),　to　prepare　EVA　foam　composites,　respectively.　The　surface　morphology　and　structure　of　P-LDHs　and　SDS-P-LDHs　were　characterized　by　XRD,　XRF,　FT-IR,　SEM　and　TEM.　Combined　with　limited　oxygen　index(LOI),　UL-94,　SEM,　TG,　tensile　strength　and　elongation　at　break,　the　effects　of　P-LDHs　and　SDS-P-LDHs　on　the　flame　retardancy　and　mechanical　properties　of　EVA　foam　composites　were　discussed.　The　results　show　that　the　addition　of　P-LDHs　and　SDS-P-LDHs　significantly　improves　the　flame　retardant　properties　of　EVA　foam　composites　and　can　play　a　good　role　in　charring　formation.　Compared　with　P-LDHs,　SDS-P-LDHs　have　better　compatibility　with　EVA　matrix.　When　the　addition　amount　of　SDS-P-LDHs　is　30%(mass　fraction),　the　LOI　reaches　27.5%,　UL-94　reaches　V-0　level,　tensile　strength　and　elongation　at　break　are　2.27　MPa　and　251%,　respectively.　The　comprehensive　properties　of　the　system　are　optimal.　©　2021,　Journal　of　Materials　Engineering.　All　right　reserved.