The low cycle fatigue fracture properties are studied based on notch and smooth specimens fatigue tests in this work. The relationship between strain and life and that between stress and energy are observated under different load conditions. The σ-N curve in double logarithmic coordinates for different notch depth and angle is found out by testing specimens. The results show that the greater stress and the deeper incision, the shorter the life of the specimen, but there is no effect on specimen life when incision angle located at 30 °-60 °. Observations of fracture surfaces show that fatigue cracks source of point and fracture morphology are closely related to stress amplitude.