A thick layer of silty fine sand is present at the Liangye Tower foundation pit in Guangzhou, and when the anchor point of the prestressed anchor cable is in the fine sand layer, water and sand kicks are prone to happen in the construction of the anchor cable, leading to the foundation pit incidents. The drilling with casing process was combined with dry-drilling to make the borehole, and behind the wall both the grout stopping bag was set at the borehole head and grouting was performed to ensure reduction in water and sand kicks during anchor cable construction; thus avoiding the foundation pit incident caused by the external ground subsidence.