Abstract: Numerical simulation based on DEM was used on bearing characteristics of single pile setup in sand by different methods.With respect to the displacement and non-displacement piles,research and comparison were done for pile setup by methods of static jacking and pre-burying respectively.In addition,pile-soil-raft interaction of abovementioned two types of piles was briefly compared.In the analysis,hypothesis of macro continuity in traditional mechanics of continuum medium was avoided.It was intended to establish the relationship between pile-soil macroscopical response and changes of soil mesomechanical parameters,which would enhance the deeper understanding of characteristics of piled raft foundation and the process of gradual failure of soil.Good consistency of the relationship between pile tip resistance and normalized penetration displacement was obtained from the comparison of results between model tests and numerical simulation.