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Field tests of settlement characteristics were carried out on the CFG pile-plate composite foundation on Beijing-Xuzhou section of Beijing-Shanghai high-speed railway.The settlements of the piles and soil between piles,the subgrade and the underlying stratum were obtained and analyzed.The results show that the settlement-time dependencies experiences three phases-rapid development phase,stable development phase and stable phase,therefore,surcharge preloading is necessary to reduce the settlement after construction.The finite element software Plaxis is applied to calculate the deformation of the pile top and the soil between piles at the embankment center as well as the settlement of CFG pile reinforcement area and the underlying stratum under surcharge preloading.The calculating results and the field test results were comparatively and comprehensively analyzed and the settlement characteristics of pile-plate composite foundation under high embankment are concluded.