“Scaling in the circulating cooling water of the phase-shifting camera affects safe and stable operation. The scale inhibition performance of PBTCA, HEDP, LQ-8531, TQ low phosphine scale inhibitor, and TQ scale inhibitor was evaluated using the limit carbonate deposition method and limit carbonate concentration ratio method. The study found that LQ-8531 had the best scale inhibition performance, providing reference for the selection of scale inhibitors in high-temperature and high salt areas.”