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Combining with the foundation treatment project of one high-rise building��the authors introduce the beating capacity and construction technique of CFG pile composite foundation��and discuss the feasibility of post-grouting technology applied in CFG pile by analyzing consolidation effect and in-situ loading test and low strain detection��The results show that the bearing capacity of foundation is obviously enforced by post-grouting CFG pile�� the vertical bearing capacity of single pile increases and higher than before for one time��The low strain detection wave shows waveform changes little on the pile-soil interface of pile tip��indicating the grouts well spreading��which effectively consolidated the soil��