Aiming at the fatigue fracture problem of rail fastening spring clip, a numerical simulation method was used to estimate its fatigue life. Firstly, a vehicle-track coupled model was established and the time history curve of rail foot vertical displacement was obtained. Secondly, a detailed fastener model was established, which uses the rail foot displacement curve as input loads. Then, the time history curves of spring clip stress and strain were obtained. Finally, the fatigue life of spring clip was analyzed according to the fatigue analysis method and cumulative damage theory. The results show that the small curve area of spring clip has the lowest fatigue life and is the most prone to damage, which is consistent with the field survey results. In addition, the fatigue life is closely related to the installation height. With the increase of the installation height, the life is sharply reduced. In order to extend the fastener service life, the excessive installation of the spring clip during operation should be avoided.%针对扣件弹条的疲劳断裂问题，利用数值仿真手段对弹条疲劳寿命进行分析。首先，建立车辆−轨道耦合动力分析模型，通过仿真得到轨底垂向位移时程曲线；然后，建立扣件精细分析模型，将轨底垂向位移时程曲线作为输入荷载，计算得到扣件弹条的应力和应变时程曲线；最后，结合疲劳分析方法和累积损伤理论，对弹条的疲劳寿命进行分析。研究结果表明：弹条小圆弧处疲劳寿命最低，最易发生损坏，与现场调查结果一致；弹条疲劳寿命与安装弹程密切相关，随着弹条安装弹程的增大，弹条疲劳寿命急剧降低；为了延长扣件使用寿命，线路运营中应避免弹条的安装弹程过高。
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