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.