The　ultra-high　toughness　cementitious　composites(UHTCC)　were　modified　by　styrene-acrylic　emulsion　and　epoxy　emulsion,　the　effect　of　the　emulsion　on　the　mechanical　properties,　bond　strength　and　shrinkage　of　UHTCC　was　studied.　The　results　show　that　compared　with　the　unmodified　UHTCC,　the　compressive　strength　and　flexural　strength　of　the　modified　UHTCC　by　styrene-acrylic　emulsion　and　epoxy　emulsion　are　lower,　but　the　bonding　strength　is　higher,　the　shrinkage　rate　is　lower;　the　ultimate　stress　and　initial　stress　at　early　age　of　styrene-acrylic　emulsion　modified　UHTCC　is　decreased,　but　initial　stress　is　increased　at　90d　age,　the　ultimate　strain　is　unchanged,　and　the　initial　strain　is　increased;,　the　ultimate　stress,　the　initial　stress　and　initial　strain　of　epoxy　emulsion　modified　UHTCC　are　increased,　but　the　ultimate　strain　is　decreased,　the　tensile　strain　hardening　phenomenon　is　not　significant.　©　2018,　Editorial　Department　of　Journal　of　Building　Materials.　All　right　reserved.