Nuclear fusion energy is regarded as the ultimate clean energy for the future, and its facilities operate under extremely harsh environments: it is necessary to confine high-temperature plasma at hundreds of millions of degrees Celsius while keeping superconducting magnets working at cryogenic temperatures close to absolute zero. For this reason, temperature measurement and thermal control run through every critical system of fusion devices. In magnetic confinement fusion devices such as tokamaks, the first wall and divertor of the vacuum chamber are directly exposed to intense thermal irradiation from plasma. A large number of high-temperature thermocouples and special temperature sensing elements are used to monitor surface temperatures and heat load distribution of components in real time, providing data support for plasma control and protection. The superconducting magnet system operates in the liquid helium temperature range, which imposes stringent requirements on the accuracy and stability of cryogenic temperature measurement, requiring platinum resistance thermometers and special temperature measuring cables adapted to low-temperature conditions. The tritium breeding blanket, cooling loops and thermal shielding systems require continuous temperature acquisition across a wide temperature range to guarantee tritium breeding efficiency and system safety. In addition, remote maintenance, teleoperation systems and auxiliary buildings of fusion facilities also require supporting temperature monitoring, heat tracing and thermal insulation. Our high-temperature sheathed thermocouples, wide-range platinum resistance thermometers, radiation-resistant special temperature measuring cables and heating cables deliver reliable supporting solutions for temperature measurement and thermal management to cope with extreme working conditions including ultra-high temperature, cryogenic temperature and intense radiation in nuclear fusion applications.