PM2.5 refers to the particulate matter whose diamete is less than or equal to 2.5 microns, also known as ifne particulate matter with poisonous and harmful substances, causing lung diseases easily.Tea contains a variety of nutrients such as polyphenols, lfavonoids, thealfavins, having a good effect for the prevention and treatment of lung disease. This paper took the toxicity of PM2.5 and the health care function of tea as a starting point of the research, discussed the lung injury caused by PM2.5 and the prevention and cure function of tea to the harm, providing a theoretical basis for preven...