To investigate the deformation law of post-construction settlement of red clay embankment fill-excavation junction section under the action of various factors, numerical simulation of post-construction settlement deformation of red clay embankment fill-excavation junction section was carried out. , The effect of various factors such as thickness of stratified step, width of stratified step and moisture content on the post-construction settlement deformation of the top surface of the red clay embankment fill-excavation junction section was studied. The results show that the influence of post-construction settlement deformation on the top surface of the embankment fill-excavation junction section is in descending order of thickness of stratified step, water content, and width of stratified step. The thickness of the stratified steps is positively correlated with the peak value of post-work settlement deformation of the top surface. The peak value of post-construction settlement deformation of the top surface of the embankment remains consistent with the increase of the width of the layered steps. The higher the water content, the higher the peak of post-construction settlement deformation at the top surface of the embankment . The peak of the overall post-construction deformation of the embankment appears in the middle of the fill section, and the peak of the overall post-construction deformation is positively correlated with the thickness of the stratified steps. The research results can provide reference for construction and deformation control of red clay embankment.