In this paper, the flexural, split tensile, impact and fatigue performance of steel tiber reinforced silica fume high-strength concrete (SIFUMHSC) under static and dynamic loads are studied. The effect of the amount of silica fume on its performance, the strengthening effects of siilca fume partieIe and steel fiber and their composite effect are discussed. Test results indicate to a full extent that different amounts of silica fume substituting for cement can remarkably improve the static and dynamic mechanicaI behaviour of steel fiberr einforced SIFUMHSC with other conditions unchanged and that the main realon for the change is that the addition of silica fume brings about a double interracial strengthening effect of fiber. cement matrix and aggregate-cement matrix, thus improving the structure and characteristics of the interface. When the addition of silica fume is adequate, the Hv-d, Ia-d and CHAS-d urves tend to be horizontal, wish dlfferences disappearing between the interiacla| foyer and matrix, so that the size and number of crack sources in the interracial zones and the whole matrix become smaller and less, and strengthening effects are better developed. This is the key to the desired performance of steel fiber reinforced SIFUMHSC.