The anchoring mechanism of prestressed anchor cables is complex, and there are many factors that affect the effectiveness of prestressed anchoring. The loss of anchoring force is related to factors such as material properties, mechanical properties of the anchored medium, quality of anchor fixtures, and construction technology. The impact of anchor cable construction technology on the loss of anchor cable anchoring force is mainly reflected in the hole forming process of the channel. Through the research on the hole forming process of the channel, a theoretical calculation formula for the friction loss of the channel has been derived, which is more in line with engineering practice and has great practical value. At the same time, corresponding engineering control measures have been proposed for the loss of anchoring force caused by hole formation in the channel