Considering the influence of the curvature on internal force of utmost state of limited section of two-step curved box-girder bridge, unit displacement during the stage of construction and supporting reactions, it has drawn up the corresponding curve and set down formula chart. 研究了曲率对两跨弯箱梁桥控制截面上的极限状态配筋内力、施工阶段单位位移及支承反力的影响,拟合出了相应的曲线并建制了计算公式和图表。