Abstract：The behaviors of composite foundation of DJM pile were studied through field test，including settlement，deep horizontal displacement，excess pore water pressure，stress ratio of pile to soil，and pile strain. The test results show that (1) the post-construction settlement can meet design requirements，(2) the settlement transits smoothly from the bridge pier to road embankments when the pile length is gradually changed，(3) the deep horizontal displacement of foundation is small enough to keep foundation stable and reduce the influence of foundation on bridge pier，(4) the excess pore water pressure dissipates slowly，but it¢s value is not large enough to have evident influence on stability of the settlement，(5) the stress ration of pile to soil is large in this case，and (6) there is linear relationship between soil pressure and DJM pile strain.
