Iron relics excavated from the Weijiazhuang site contained high content of harmful chlorine salts, which threatened the safety of these cultural relics. After a series of experiments, 0.005 mol/L NaOH solution was selected for desalination. Direct immersion combined with alternating cooling and heating and ultrasonic treatment were used for container shaped iron relics. A 2%Primal AC33 solution was used for reinforcing iron weapons with sheath before desalination, and wood pulp was also used to remove salt in iron relics having traces of paint. As a result, the chlorine content of the iron was greatly reduced after desalination. The results were very satisfactory.