Abstract: In this research the effect of high temperature on the compressive strength of silica incorporated mortar specimens have been studied. For this purpose prismatic mortar specimens containing 0, 5 and 10% silica fume substituted for cement with different w/b ratios and cured at different ages were prepared. The compressive strength before and after exposure to high temperatures of 300 and 600°C were recorded. It was observed that silica fume incorporated mortars has no potential effects in the face of fire hazardous.