Abstract:The overhaul of the first furnace period of the two 72MVA nickel-iron electric furnaces designed by China ENFI in Dagon Mountain, Myanmar has completed where No. 1 electric furnace, with the campaign length being six and a half years, started heating up in August 2012, and shut down for maintenance from February to May 2019; No. 2 electric furnace started heating up in May 2013, and shut down for maintenance from December 2020 to May 2021, with the campaign length of seven and a half years. This paper introduces the overhaul and design improvement of 72MVA nickel-iron electric furnace, expecting to contribute to the development of nickel-iron electric furnace technology and equipment.