The temperature dependence of the static fatigue behaviours of SiC was examined. The experimental result of the fatigue strength which can be represented using Larson-Miller plots indicates that the thermally activated processes such as oxidation and viscous flow of grain boundaries are dominant in the elevated temperature static fatigue. However, the temperature dependence of the static fatigue strength becomes unclear with the decrease of the temperature because the influence of the scatter of the defect sizes becomes realatively stronger. The static fatigue crack growth shows complicated behaviour involving thc crack velocity reduction and crack arrest. So that the static fatigue limit below which thc crack does not show the extension possibly exists. The new fatigue design rules for structural ceramics based on the defect size and temperature dependence of static fatigue strength is proposed.