Due to environmental influences, salts are prone to crystallize on the surfaces of pots. In the conservation of pots, desalination is one of most important treatments. In this study, the influence of various factors , such as eluent velocity and concentration, on the crystalline salt and the progress of desalination were analyzed by dual ion chromatography. These experiments showed that eluent velocity and concentration affect the separation of ions and shapes of the chromatography peaks. With Na₂CO₃~NaHCO₃ at a concentration of 2.5~1.7mmol/L and a flow rate of 0.6mL/min, or pyridinedicarboxylic acid~HNO₃ at 0.8~1.6 mmol/L and 0.7 mL/min, all ions show well separated peaks with good peak shapes. The standard curves were highly linear, reproducible, and precise with high correlation coefficients. Therefore, it can be concluded that dual channel ion chromatography is capable of detecting ions and giving concentration information. The method is proved to be quick, easy and accurate. The method can be used to monitor the desalination process.