Abstract: The electrode was prepared by using carbon nanotubes （CNTs）, and the electro-adsorption desalinator with flow-through capacitor was employed to investigate the desalination performance of CNT electrode. The results show that the CNT electrode is stable and low-resistance,which is about 2.4Ω in saltwater, and the relationship between specific desalination data and initial concentration is listed as follows,W_desal=0.18C^1/3. In the electro-adsorption desalinator with flow-through capacitor, the CNT electrode has a stable desalination performance and long life.