Here ,the main factors influencing the bridge deflections were analyzed in construction progress .According to the theoretical calculation method of bridge structure ,the deflection calculation formula of bridge was obtained under cor-responding loads ,and then was applied in the bridge deflection calculation of different construction phases .The construc-tion alignment of the bridge was controlled by setting corresponding prestressing cambers .Finally through the example of practical engineering ,the rationality of setting prestressing cambers was validated .This result will provide the theoretical base for setting reasonable prestressing cambers of similar bridge engineerings .%分析了在悬臂浇筑施工过程中影响梁体挠度的主要因素，根据桥梁结构理论计算方法，得出了在相应荷载作用下挠度的计算公式，对各施工阶段的梁体挠度进行合理的计算，再通过设置相应的预拱度，控制桥梁的施工线形。最后通过实际工程算例，证明了此方法设置预拱度的合理性，为以后同类桥梁的预拱度设置提供依据。
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