Abstract: With the development of new energy vehicles and national defense industry in China, higher requirements are put forward for the temperature stability of Nd-Fe-B. Based on the latest domestic and overseas developments, this paper summarized two directions of the temperature stability of Sintered Nd-Fe-B. One was focus on increasing the maximum operating temperature of Nd-Fe-B. The internal correlation between coercivity, coercivity temperature coefficient, squareness and the maximum service temperature was introduced. The second was focus on reducing the remanence temperature coefficient of Nd-Fe-B magnet. The influence mechanism of Co and Heavy Rare Earth on the temperature coefficient and microstructure of the magnet was described in detail.