Abstract: Welding is one of the most important structural repairing technology in modern manufacturing industry. The development of welding repairing technology is of great significance to improve the reliability and service life of metal structure. The research progresses of brazing, laser welding, friction stir welding and other welding method applied to the metal structure repairing were analyzed, then the advantages and disadvantages of different processes as well as its application field were discussed. Factors such as welding parameters design, performance testing and process control technology that acts on the welding quality were researched, and in order to get in-depth understanding of welding phenomenon of complex physical and chemical changes in the process and give support to develop higher quality welding repairing technology, the existing methods were summarized. The detection, numerical simulation and control methods of residual stress and deformation were systematically discussed, finally the future application of welding repairing method in metal structure was prospected.