Gears are important components in mechanism, which take roles of transfering power and speed. Their failures are mainly caused by tooth fracture and abrasion. However, reparation of the damaged gears is still a popular and hard problem in machinery industry. In this paper, as to remanufacturing or repairing the damaged gear-tooth, it introduced connotation and technical characters of remanufacture engineering, stated connotation and technical processes of laser remanufacture. Then it devided the damage of gear tooth into three sorts, and discussed the vital problems on laser remanufacturing of the damaged gear tooth from various aspects such as remanufacturing processing, performance and shape of the remanufactured teeth. With practical samples, it intepreted the laser remanufacturing methods for the fracture, tooth-surface abrasion and tooth-end abrasion gears individually. At last, it points out that laser remanufacturing is great practical technology for damaged gear repair, which shows great prosperous applications.