White tea is one of the six major types of tea in China, and is characterized by a relatively simple production process, which mainly consists of two steps: withering and drying, and is significantly different from the unfermented process of green tea and the fully fermented process of black tea. Old white tea is the product of white tea after a certain number of years of aging. After long-term storage, its flavor, aroma and soup color will have obvious changes, with unique tasting value and collection value.