Abstract: GB/T 10045—2018《Tubular cored electrodes for gas shielded and non-gas shielded metal arc welding of non-alloy and fine grain steels》,GB/T 17493—2018《Tubular cored electrodes for gas shielded metal arc welding of creep-resisting steels》,GB/T 36233—2018《Tubular cored electrodes for gas shielded and non-gas shielded metal arc welding of high strength steels》,GB/T 17853—2018《Tubular cored electrodes and rods for gas shielded and non-gas shielded metal arc welding of stainless and heat-resisting steels》are the four national flux-cored wire standards issued on May 14^th,2018 and implemented on December 1^st,2018. The revisions of the standard system had big adjustment,various technical content,and wide range influence. According to the latest national standards,the major changes between the old and new standards and the differences between the significant changes and international standards were introduced,which makes users better understand,publicize and implement the new standards.