A. Oxidation: the sterilization mechanism is to release new ecological atomic oxygen and oxidize the active groups in bacteria; Sterilization is characterized by rapid and intense action, which can kill all microorganisms, including bacterial spores and viruses. Mainly surface disinfection, such as chlorine dioxide, hydrogen peroxide, ozone, etc. Such a disinfectant is a disinfectant. B, aldehydes: the sterilization mechanism is to denature or alkylate protein; The characteristic of sterilization is that it is effective for bacteria, spores, fungi and viruses. But the temperature has a great influence. Such as formaldehyde, glutaraldehyde, etc. This disinfectant can be used as a disinfectant. C. Phenols: the sterilization mechanism is to denature and precipitate protein or inactivate the enzyme system; The characteristic of sterilization is that it is effective for fungi and some viruses. D, alcohols: the sterilization mechanism is to denature protein and interfere with metabolism; Sterilization is effective for bacteria, but not for spores, fungi and viruses, such as ethanol and ethyl propanol. This disinfectant belongs to intermediate disinfectant and can only be used for general disinfection. E, alkali and salt: the sterilization mechanism is to denature, precipitate or dissolve protein; The characteristic of sterilization is that it can kill bacterial propagules, but it can't kill tiny spores, viruses and some microorganisms that are difficult to kill. Weak bactericidal effect and strong corrosiveness, such as nitric acid, caustic soda and salt. Can only be used as a general preventive disinfectant. F. Halogen: The sterilization mechanism is to oxidize the active genes in bacteria, and combine with amino groups to denature protein. It is characterized by killing most microorganisms, mainly surface disinfection, with unstable properties, and its sterilization effect is greatly influenced by environmental conditions, such as sodium hypochlorite, "84" disinfectant, excellent chlorine and so on. This disinfectant is an intermediate disinfectant and can be used as a general disinfectant. G, surfactant: sterilization mechanism is to change the permeability of cell membrane, make cytoplasm leak, hinder breathing or denature protease. The characteristic of sterilization is that it can kill bacterial propagules, but it has poor effect on spores, fungi, viruses and tuberculosis. It works well in alkaline and neutral conditions, such as bromogeramine and chlorpyrifos. This kind of disinfectant has low efficiency and can be used as a general disinfectant.