With reference to the cracks occurring in the reinforced concrete pier shafts of a railway bridge during construction , the causes leading to the cracks and propagation process of the cracks are analyzed by means of theoretic calculation and finite element simulation 结合某铁路桥施工期间钢筋混凝土墩身开裂现象,通过理论与有限元仿真相结合的方法,对裂缝的出现原因及发展过程进行了分析。