Abstract: The characteristics, principle and application of TAG high-temperature oxidation and corrosion analyzer were introduced. The TAG high-temperature oxidation and corrosion analyzer can realize the in situ testing under controllable atmosphere (dry, wet and corrosive) and controllable temperature conditions. The design of double furnace body minimized the interference of the buoyancy effect. Moreover, the suspension sample was designed to contact the whole atmosphere, which can accurately measure the small mass change. The TAG high-temperature oxidation and corrosion analyzer can be used to study the decomposition of inorganic and organic materials at high temperature. It can also apply to investigate the oxidation and corrosion mechanisms of metals and ceramics under single or multiple atmospheres.