Application of xylitol in diseases of respiratory system caused by haze

The invention provides an application of xylitol in preparing a medicament, a health product, a beverage or food for preventing and/or treating diseases of the respiratory system caused by haze. The xylitol achieves the effects of preventing and treating diseases of the respiratory system caused by haze by restraining growth of harmful bacteria such as streptococcus, gas-producing streptococcus and candida streptococcus, in hazy weather, so that dependency of people on antibiotics can be reduced without generating drug resistance. The product provided by the invention not only has a remarkable prevention and treatment effect on diseases of respiratory system caused by haze, but also is convenient to take; moreover, the xylitol product is sugar alcohol without harms on body, is sweet in taste and can prevent and treat diseases of the respiratory system caused by haze while people enjoy the life. The xylitol product provided by the invention does not generate any bad influence on taste sense of a patient while achieving the effect of preventing and treating the diseases of the respiratory system caused by haze, and is easy to accept by vast patients.