Abstract: The handling steps, analytical methods and announcements are introduced by means of a successful treatment example of bored concrete piles without satisfying the requirements of bearing capacity in a project of Shandong. The principles to determine the position of supplement pile , pile length and pile quantity are provided. With regard to the position of the supplement pile, the effect on the foundation settlement , structural form, load distribution , geological conditions and so on should be considered in order to make foundation settlement as uniform as possible. The length of supplement pile should be determined by pile spacing and settlement requirements. When the spacing s of the supplement pile and the original pile satisfy the code and foundation settlement requirements, the supplement pile can be as long as the original pile; when they do not satisfy the code or foundation settlement requirements, the length of the supplement pile should be greater than that of the original pile. Under the condition that the bearing capacity and the deformation requirements are satisfied, the measures such as post-grouting bored concrete piles can be adopted in order to enhance the bearing capacity of the pile and reduce pile quantity as possible.