Abstract: The coating of E5515-G,a low alloy steel electrode,was added in different amount of ceria(CeO₂) for enhancing electrode properties which was studied by means of impact toughness,metallographic examination and X-ray fluorescence spectrometry test.The results show that the proper addiction of CeO₂ is beneficial to the desulfurization and dephosphorization of the weld and improves the impact absorbed energy of deposited metal.Different addition amount of CeO₂ can lead to various desulfurization efficiency,which makes a great difference,whereas the dephosphorization efficiency is unconspicuous.The microstructures of the weld can be effectively made fine by adding CeO₂ into electrode coating,but the addition amount of CeO₂ should be proper.The microstructure of the weld is the finest when the addition amount of CeO₂ is 3%.When the amount of CeO₂ is optimal,the S content in weld metal will decrease by 58.128 1%,while the P content 14.285 7%.