Trinary solid stable chlorine dioxide is a new type of powerful disinfectant which possesses the properties of high efficiency and speed, low acidity and less loss of ClO₂ in activating reaction. In order to learn more about the disinfectant, experiments have been carried out to study its stability, corrodibility, and disinfecting actions, etc. The results show that (1) the gain rate of ClO₂ is 96.5%, acidity of activating solution is pH=4.84, and the decreasing rate of ClO₂ is 3.1% followed by a storage for 14 days at (54±1) ℃; (2)its solution containing ClO₂ 80 mg/L can kill 100% Escherichia coli and Staphylococcus aureus in 3～5 min, its solution containing ClO₂ 400 mg/L can also kill 100% Bacillus subtilis var. niger spores in 60 min, its solution containing ClO₂ 300 mg/L can fully destroy antigenicity of HBsAg in a 20 min contact time;(3) a solution of the disinfectant at a concentration of 800 mg/L ClO₂ is essentially non corrosive to stainless steel and moderate corrosive to carbon steel, copper, and aluminum.