Tea brewed with medicines such as rehmannia, Zhi Mu, and Andrographis paniculata can be effective in clearing the lungs. 1. Rehmannia glutinosa can be used for clearing heat and fire, generating fluids and quenching thirst (promoting the production of fluids to relieve thirst). It is often used in the treatment of vomiting, heartburn and thirst, coughing, and heat drenching (burning and stinging pain during urination, accompanied by frequent urination and urgency, and discomfort of traction in the lower abdomen) and other symptoms. Caution should be taken when using this herb for people with deficiency and coldness of the spleen and stomach (weak and cold spleen and stomach). 2. Zhimu’s function is to clear the lungs and diarrhea fire, moisten dryness and promote the production of fluids. It is often used in the treatment of lung-heat cough, fever, tidal fever with bone vapor (a burst of heat, feeling that the heat comes from inside the bone to the outside), constipation, etc. The adverse effects of this drug are not clear. The adverse effects of the drug are not clear, but people with weak spleen and stomach should use it with caution. 3. Andrographis paniculata can be used to clear away heat and detoxify the toxin (removing heat and toxicity from the body), cool the blood and eliminate swelling (treating blood heat and eliminating swelling and pain). It is often used in the treatment of lung-heat cough, fever, sore throat and other symptoms. The adverse effects of this drug are not clear, and caution should be exercised if the spleen and stomach are cold. Tea drink efficacy is limited, can not completely replace the medication to treat the disease, if necessary, it is recommended to go to the regular hospital in time, under the guidance of a professional physician, according to their own situation reasonable choice.