There are more types of green tea, the common ones are Biluochun, Xihu Longjing, Emeishan tea, etc. Green tea can supplement the body’s need for tea polyphenols and other nutrients. Green tea can supplement the body’s need for tea polyphenols and other nutrients, moderate consumption of human health benefits, but green tea as a beverage, there is no drug efficacy and effect. Green tea is one of the main types of tea in China, which is made from the new leaves or buds of the tea tree, unfermented, by killing and drying. China produces green tea from an extremely wide range of origins, and there are many different types, the common ones being Biluochun, Xihu Longjing, Emei Mountain tea, etc. Green tea has a refreshing flavor, and can provide relief to the body. Green tea has a refreshing flavor, relieves thirst, and has some nutritional value. The protein and carbohydrate content of green tea is high, 34.2g/100g, 34.7g/mg. In addition, green tea also contains a variety of minerals, such as calcium, iron, magnesium, manganese, potassium, etc., as well as fluorine, tea polyphenols, vitamins and other components. Drinking green tea in moderation can replenish various nutrients and other elements for the human body, and maintain the normal physiological structure of the human body, but the content of the substances in green tea is limited, and the purpose of treating the disease cannot be achieved through the way of drinking. It is recommended that patients should consult a doctor in time when they feel unwell. In addition, green tea contains a certain amount of caffeine, which should be avoided before going to bed to avoid affecting the quality of sleep.