STDs are mainly transmitted through contact, but some STDs can also be transmitted through contaminated materials. Therefore, the prevention of STDs in addition to cleanliness, should also strengthen the cleaning and disinfection work, especially the family with STDs, should pay more attention to disinfection. The main disinfection methods are: sunlight: STD pathogens such as syphilis spirochetes, gonococcus, papilloma virus, etc., more delicate, both afraid of cold and heat. For example, gonococci can only survive for 15 minutes at 45°C, and only 90 minutes under ultraviolet radiation. Therefore, the things used by STD patients, where they can sunlight should be exposed to the sun for 2-3 hours, can achieve the purpose of disinfection. Soaking: For some dirt that can be soaked, use a bleach solution containing 0.1%-0.5% effective chlorine or 6% hydrogen peroxide for 30 minutes to disinfect. Boiling: Patients’ worn clothes, used towels, bath towels, bowls and basins can be disinfected by boiling. However, they should be washed with soap before boiling. Then put them in a pot and boil and wash them. For items contaminated by AIDS, boil them for 20 minutes. Generally boiling for a few minutes will kill the pathogens. Wiping: For toilet, doors, windows, tables and chairs, which cannot be sun-dried or boiled, use the wiping method to disinfect. Rinse with water before wiping, and then wipe with disinfectant solution. The commonly used disinfectant solution is bleach with 5% effective chlorine, and Lysol is also available. Ventilation: often open the windows for ventilation to keep the indoor air fresh and dry, but also has a certain sterilization effect.