With the rapid development of international LNG industry,the demand for low-temperature materials of LNG storage and transportation is increasing. For both the service performance and manufacturing cost,the low-temperature high manganese steel with Mn content of about 20% ～28% has been paid more and more attention. Mn is used instead of Ni,and C,N,Cu are added to some extent. The low-temperature high manganese steel has a broad application prospect because of its low cost and good austenite stability. The common problems of low-temperature high manganese steels welding include hot crack,element burning,and low temperature performance of joint. High requirements on welding consumable development and welding technology optimization are put forward. The research and development of low-temperature high manganese steel and its welding technology will help to increase the international competitiveness of China’s LNG shipbuilding industry.