Abstract: Ethylene glycol has been widely used in domestic and foreign natural gas fields as gas hydrate inhibitors. Aiming at the shortcoming of high energy consumption for currently common flash desalting process, a method of using desalting agent to remove sodium chloride in the ethylene glycol is proposed in this article. Low cost, efficient and recyclable desalting agent DA-A is filtrated by the theory that the solubility of sodium chloride is related to the polarity of the solvent. The experiment studies how temperature, pH value and the water content of the ethylene glycol system, as well as the dosage and the adding method effect the desalting ability of DA-A, and the recovery capacity of the DA-A is tested.