A. Oxidation: The sterilization mechanism is to release new ecological atomic oxygen and oxidize the active groups in the bacteria; the sterilization feature is fast and strong, and can kill all microorganisms, including bacterial spores and viruses. . Mainly surface disinfection, such as chlorine dioxide, hydrogen peroxide, ozone, etc. These disinfectants are sterilants. B. Aldehydes: The bactericidal mechanism is to denature or alkylate proteins; the bactericidal characteristic is that it is effective against bacteria, spores, fungi, and viruses. But temperature has a greater impact. Such as formaldehyde, glutaraldehyde, etc. This type of disinfectant can be used as a sterilant. C. Phenols: The bactericidal mechanism is to denature and precipitate proteins or inactivate enzyme systems; the bactericidal characteristic is that it is effective against fungi and some viruses. D. Alcohols: The bactericidal mechanism is to denature proteins and interfere with metabolism; the bactericidal characteristics are effective against bacteria, but ineffective against spores, fungi, and viruses, such as ethanol, ethylene propyl alcohol, etc. This type of disinfectant is a medium-effective disinfectant and can only be used for general disinfection. E. Alkali and salts: The sterilization mechanism is to denature, precipitate or dissolve proteins; the sterilization characteristic is that it can kill bacterial propagules, but cannot kill bacterial spores, viruses and some difficult-to-kill microorganisms. It has weak bactericidal effect and strong corrosiveness, such as nitric acid, caustic soda, table salt, etc. It should only be used as a general preventive disinfectant. F. Halogens: The bactericidal mechanism is to oxidize the active genes in the bacteria and combine with amino groups to denature the protein. It is characterized by being able to kill most microorganisms, mainly for surface disinfection, and is unstable in nature. The bactericidal effect is greatly affected by environmental conditions, such as sodium hypochlorite, "84" disinfectant, chlorine, etc. This type of disinfectant is a medium-effective disinfectant and can be used as a general disinfectant. G. Surfactants: The bactericidal mechanism is to change the permeability of cell membranes, causing cytoplasm to leak out, hindering respiration or denaturing proteases. The bactericidal characteristic is that it can kill bacterial propagules, but has poor effect on spores, fungi, viruses, and tuberculosis bacteria. The effect is good under alkaline and neutral conditions, such as Xinjierfen, Baiduza, etc. This type of disinfectant is a medium and low-efficiency disinfectant and can be used as a general disinfectant.