Abstract: Based on the in-site measurement results of the post-grouting spinning drill pile, the engineering properties, load transferring law and side-friction distribution law of pile are analyzed. The development degree of side-friction of the pile, which subjected vertically loads, decays with the buried depth of the pile. The distribution relationship of development degree of side-friction, toe-friction and computation method of the single pile bearing capacity of the post-grouting spinning drill pile are provided. Theory basis for design of post-grouting spinning drill pile are provided.