DX pile which is a new-type of variable cross-section pile has the characteristics of easy, convenient and fast construction. When constructing the DX pile, only one extra procedure of extruding and expanding the bell cavities is added, after drilling (impacting) hole. So that the form of pile shaft, bells and pile tip bearing the load together can be achieved. DX pile has not only high bearing capacity, but also effectively controlled settlement of pile deformation. The static load test of a highway bridge foundation shows that the bearing capacity of DX pile is more than twice of the straight pile with the same parameters, while the settlement is only a half. Meanwhile, the ascending displacements of anchor piles are less than 1 mm, which means even in the uplift performance, DX pile also has a great advantage.