A series of repeated shear tests of asphalt mortars was conducted by using dynamic shear rheometer（DSR） at different temperatures and stress levels. The correlation of three fatigue life criteria （NP20，Nfm，Nf50） and the effects of filler bitumen ratio（by mass）, temperature and stress level on fatigue life of asphalt mortar were studied. Fatigue life prediction equations of asphalt mortars considering influence of temperature were established by fitting test data. The results show that there are good linear relationships between Nfm and Nf50, Np20 and Nf50. Nf50 is recommended as a simple and effective fatigue life criteria of asphalt mortars. At the same temperature and stress level, the fatigue life of asphalt mortar increases with the increase of filler bitumen ratio. At the same stress level, the fatigue life of asphalt mortar（filler bitumen ratio 08） decreases with the increase of temperature. The fatigue lives of asphalt mortars at different temperatures and stress levels could be well predicted by the established fatigue life prediction equation.