There is a difference in the flavor and attribution, efficacy and main treatment of thatched grass root and fishy grass. Cao Cao root belongs to the lung meridian, stomach meridian and bladder meridian, with a sweet flavor, and is considered by Chinese medicine to have the effect of clearing heat and diuretic, cooling blood and stopping bleeding. In clinical practice, it is generally used to treat symptoms such as vomiting blood with blood heat, urinating blood, coughing with lung heat, vomiting with stomach heat, and edema. People with cold spleen and stomach as well as excessive urination and thirst are not recommended to take thatched grass root. Fish grass belongs to the lung meridian, pungent flavor, Chinese medicine believes that it has the effect of eliminating canker sores and pus, diuretic and diaphoretic (to improve the problem of dribbling in the urine, small amount of urine does not pass), clearing away heat and detoxification, and so on. It can be used as an ingredient or medicine, and can be clinically effective in diseases such as lung-heat cough, lung abscess, malaria and hemorrhoids. But Yang Qi deficiency as well as Yin sores should not take Fishweed. Thatch root and fishweed is very different, not blindly indiscriminate use, if the body appears uncomfortable symptoms, need to be identified by a professional doctor, and then use drugs reasonable treatment.