The most ideal method to measure the water-soluble Cl- ion eluted from iron artifacts is conducting the analysis on desalting solution by Ion Chromatography. But most institutes related to cultural heritages use Cl meter by reason of lack of budget and experts. This study evaluated reliability and stability between Cl meter and Ion Chromatography by doing cross-validation with results from two methods to detect Cl- ion of desalting solution. From D.I water, extremely small quantities of Cl- ion was detected by the influence of remaining water-soluble Cl- ion at the electrode of Cl meter and water-soluble Cl- which remains in Sodium sesquicarbonate, components of reagent was detected as well. The first desalting solution had the most Cl- ions, Cl- ion slightly decreased from the second to the fourth desalting solution and tend to decrease again at the stage of dealkalified in D.I water. Each Cl meter has the standard deviation according to the measured numbers and the higher concentration of Cl- ion the desalting solution has, the wider the deviation is. But when the concentration of Cl- ion is low, it was stable to use Cl meter to detect the concentration of Cl- ion from iron artifacts because there is the small deviation, It is thought that conductivity meter method is not suitable for measuring Cl- ion, because the electrical conductivity of alkaline solution is too high to measure Cl- ion.