Abstract: Based on in-situ test,the first-hand materials about the pile foundation were obtained during and after embankment fill behind abutment in soft ground,and the regulation for bending moment and the negative skin friction of the pile was revealed.It was shown by the test results,the influence of embankment fill on the abutment piles existing not only during the construction,but also in a long time after the construction.The negative skin friction was nonlinearly distributed along the depth of pile and the bending moment increased with the height of embankment.