Research purposes: The design method for the rigid composite foundation is commonly used for the rigid composite foundation under embankment and the design result is big different from the actual situation． It brings about the high cost of the rigid pile composite foundation to cause the impact on the wide application of the rigid pile composite foundation． In order to better application of the rigid pile in the composite to enhance the bearing capacity of the embankment and bring the good bearing capacity of the rigid pile into play，the experimental research is done in large －scale on the design method for the rigid pile composite foundation under embankment．
Research conclusions: The research shows the design method for the rigid pile composite foundation under embankment should follow the two basic principles: one is to bring the rigid pile into the major play and the other is to bring the good bearing capacity of the rigid pile into play． In order to achieve these targets，the effective way is to determine the bearing ratio between the pile and as three，enlarge the distance between piles and enhance the replacement rate． If the rigid composite foundation is designed with the proposed method and the pile reaches at the supporting course，the settlement deformation of the embankment can be controlled to meet the specification requirement of the post － construction settlement for the bridgehead and the cost can be largely reduced．
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