Fatigue life can be predicted by analyzing the fatigue crack extension. Reasonable maintenance strategies can be made. Economic losses can be avoided because of the unexpected halt. First, in this paper, two types of crack fronts are studied. 通过对转子疲劳裂纹的扩展分析,可预测裂纹转子的疲劳寿命,制定合理的维护策略,避免因意外停机而带来的经济损失。