Tieguanyin is a tea with aged aroma national standard, according to the announcement issued by the National Standards Commission, approved GB/T30357.2-2013 ""Oolong Tea Part 2: Tieguanyin"" National Standard No. 1 Change order, add the clause ""4.1.3 Aged Tieguanyin: With Tieguanyin gross tea as the raw material, through the unique process of stem picking, sieving, blending, baking, storage for more than 5 years and other characteristics of the Tieguanyin products made of aged quality characteristics.""Tieguanyin belongs to the oolong tea series and is a semi fermented special tea between black tea and green tea. The birth of oolong tea harvesting technology in the late Ming and early Qing dynasties was a significant innovation in China's traditional tea making technology. In Anxi, the birthplace of Tieguanyin, tea farmers have a habit of storing tea in every household. In addition to drinking, it is mainly used to clear heat and detoxify, relieve heat and calm Qi. For tea farmers, aged Tieguanyin is more of a medicinal and health value besides drinking it. In summer, they will use aged Tieguanyin to stir fry salt or pickle honey to make drinks to prevent heatstroke, reduce food intake, clear heat and detoxify, etc.

Fan Cha Tieguanyin ""YI QI CHENG GONG"" adopts red core Tieguanyin from the core production area of Tieguanyin's birthplace as raw material, and has been aged in dry storage for 20 years. The beauty of the craftsmanship of 20 years ago can be seen in the particles. The strands are evenly distributed, shiny black, and have a rich, smooth, and thick taste. The special blend of old fragrance and honey fragrance is a work of art completed by ingenuity and time, and it also has the value of drinking and collecting agricultural heritage. The launch of YI QI CHENG GONG is a manifestation of the promotion and development of the Tieguanyin tea industry and the establishment of the cultural self-confidence of tea people and tea merchants.