Al-Li alloy has the characteristics of low density， high specific modulus， high specific strength， good fatigue resistance and corrosion resistance， and is considered to be one of the most promising structural materials in the aerospace field. This article reviews the development history of Al-Li alloy， introduces the composition， structure and weldability of the new generation of 2195 Al-Li alloy， and analyzes the main problems in the welding process. Meanwhile， this paper also summarizes the research work completed by domestic and foreign institutions to improve the structure and mechanical properties of the joint by optimizing the welding wire and arc welding crafts of 2195 Al-Li alloy. It looks forward to the development trend of domestic Al-Li alloy arc welding technology.