Abstract: Stainless steel electrode CHS027LT for LNG tank was introduced about slag system selection,formula designation,and product performance,which has ultra-low carbon,ultra-low temperature and high toughness（-196℃）,intergranular corrosion resistance. Several welding position process performances,physical and chemical properties of deposited metal at different heat inputs were compared and mechanical stability of three batches finalized electrode products was researched. The results showed that at the welding heat input ranged from 10.2kJ/cm to 16.9 kJ/cm,the electrode has excellent welding process performance,and the physical and chemical properties of the deposited metal meet the technical requirements,three batches finalized electrode products have the stable mechanical properties,and the impact energy at-196 ℃is higher than 50 J. The microstructures of the deposited metal are austenite and a small amount of ferrite.