Abstract: As the key static equipment in petrochemical plant,reformer furnace works in complex conditions and the furnace tube often fails in service. The aging failure mechanism and welding repair technology of the typical furnace tube material were summarized by combining with the microstructure and the welding performance. Not only microstructure evolution process of furnace tube material and its effect on the properties of welding,but also main welding methods were introduced. Finally,the main problems and solutions during welding repair process were summarized.