The post-grouting bored pile was used for the foundation pile for Xiangluowan project of Sinosteel in Tianjin, the maximum length of the pile was 76m and the designed eigenvalue of bearing capacity of single pile was up to 15000kN. The paper elaborates the bored pile about its construction technology, technical difficulties and the solutions, straight thread connection technology for reinforcement cage at pile hole entrance and post grouting construction technology. The field tests prove that all the piles are of the class Ⅰ, the bearing capacity of single pile meets the design requirements and the maximum value of ultimate bearing capacity is 35000kN.