In order to ensure the correct application of the post-grouting technology for the holing cast-in-place pile with slurry retaining, this paper analyzes the mechanism of post-grouting technology to the cast-in-place pile with slurry retaining hole and the application status, some corresponding measures or suggestions are put forward based on the analysis on the factors that affect the application effect, such as the qualification of the employees, the quality of the completed holes and piles, grouting valve, grouting pump and the relevant grouting parameters.