Harbor yard is often reclaimed through dredging and filling. Limited by the filling process，it is easy to cause the fine particle content around the outlet to be high. Since the soil is not horizontally layered，it is impossible to directly use the layer wise summation method and empirical formula to calculate long-term settlement. In order to solve this engineering problem，firstly，through the creep test of sandy soil，the relevant parameters of rheological elements with different fine particle content and different types of fine particles are obtained；then the rheological element parameters are used for analysis and calculation in Flac 3D；and finally，the commonly used empirical calculation method is adopted to fit the long-term post-construction settlement. The comparison of Flac 3D results with experimental data and empirical calculation methods shows that the long-term settlement of sandy soil can be calculated by combining numerical simulation and hyperbolic method.