提出了软土路基设计为过程化设计的概念 ,在此基础上 ,采用最小二乘拟合数学方法 ,建立软土路基沉降变化趋势面实用模型的过程和方法 ,并给出实例 ,为进一步运用时间序列分析方法定量研究沉降趋势 ,实现工后沉降量的精确预测和控制模型的建立 ,以及在计算机上实现三维量化分析奠定基础 The concept of soft soil embankment design as process design is put forward. On this basis, the least squares fitting mathematical method is used to establish the process and method of practical model of trend surface of subsidence of soft soil subgrade. An example is given for further application Time series analysis method to quantitatively study the trend of settlement, to achieve accurate prediction of post-construction settlement and establishment of control model, and to establish a three-dimensional quantitative analysis on a computer basis