Because of good adaptability and speedy construction, rotary holing cast-in-place piles have been widely used in engineering fields, but the disadvantages of difficult sediment control and inconvenience for construction in areas with large-size gravels restrict its development. Based on the engineering case of BOECD, the key points of construction technology of post grouting for rotary holing cast-in-place pile by wet operation are firstly analyzed; then grouting capacity, grouting pressure and slurry amount of post grouting are summarized; finally, some suggestions are put forward for the engineering problems such as hole bottom sediment control and fill section construction process, which may be helpful to the similar projects in the future.