The influences of Young’s module of pile material on negative skin friction（NSF） characters are analysed.It is pointed out that changes of Young’s module of pile material may cause changes of compressive deformation of pile.For low rigidity pile which often used in composite foundation

compressive deformation has to be taken into account.Finite element analysis shows that a critical value exists for Young’s module of pile that affects NSF character.Influences of Young’s module of pile on NSF character may be neglected when module of pile is greater than the value.When module of pile is lower than the value

compressive deformation of pile increases

differences of pile top deformation and pile toe deformation increase.It makes neutral point in pile move up and maximum additional stress in pile decreases

which may be useful to the research for NSF characters of low rigidity pile in composite foundation.