The six-petal plum-shaped concrete pile is a new type of special-shaped pile developed to meet the needs of the project. In order to promote the popularization and application of the six-petal plum-shaped concrete pile, the geometric characteristics of the section are studied based on the two key sectional parameters (the outsourcing radius of six-petal plum-shaped concrete pile and the open arc angle of six-petal plum-shaped concrete pile). The results show that: 1) the cross-sectional area and the perimeter of the section gradually increase with the increase of the outsourcing radius and the open arc angle of the pile; 2) the perimeter-area ratio gradually decreases with the increase of the outsourcing radius of pile, and increases with the increase of the open arc angle of pile; 3) when the cross-sectional area of the six-petal plum-shaped concrete pile is equal to that of the circular pile, the cross-sectional perimeter of the six-petal plum-shaped concrete pile is 0～10% larger than that of the circular pile with equal cross-section in the range of 60°～180° ; 4) the main moment of inertia of the six-petal plum-shaped concrete pile increases with the increase of the outsourcing radius of pile, and is greater than the main moment of inertia of the circular pile with the same cross section area. The results can provide some references for the design of pile foundations.