Prediction accuracy in order to improve the sedimentation of roadbed,this paper introduces the concept of combination forecast,based on the settlement of the measured curve of different phase change law analysis,by adjusting the weights will be effective together several kinds of prediction model to predict post-construction settlement,practice proves that this method is of strong operability,effectively improve the prediction accuracy.%为提高路基工后沉降预测精度，引入组合预测的理念，基于沉降实测曲线不同阶段变化规律分析，通过调整权重将几种推算模型有效组合在一起预测工后沉降，实践证明该方法可操作性强，有效的提高了预测精度。
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