Abstract: Design of Passenger Dedicated Line roadbed is on more reflected strict control on the embankment deformation.In the DK61 site of some railway line where soft clay foundation was used by gravel pile treatment,field monitoring of settlement and stress for composite ground was conducted on-stress variation,so data of settlement of embankment and foundation,soil pressure and pore water pressure have been obtained in the process of construction and after construction of the embankment.On the basis of the arrangement and analysis of the results in the field testing,the settlement of composite foundation during the construction and after construction of embankment,influence factors of settlement of composite ground under field construction conditions and settlement prediction rules has been studied,and it has statistically argued stress mechanism of soil pressure and pore water pressure.These research results provide useful information for theoretical research and engineering design in the further.