The Changshengchuan green brick tea making technique was founded by the He family, a tea-making family in Hubei in 1368 AD, and has been passed down for 20 generations. After 77 processes such as fermentation and blending, the tea can be aged in piles of 120 tons and ventilated to ensure that the tea does not "bloom" during the fermentation process. The tea bricks made are the densest among the compressed teas, and have the effects of removing stagnation and greasiness, reducing fat and controlling sugar. The black tea making technique (Changshengchuan green brick tea making technique) originated in Xianning, Hubei, and spread to Yichang, Hubei. It is a black tea making technique that uses high-quality tea leaves from southwestern Hubei as raw materials, and is made into tea bricks through pile fermentation and high pressure, and is crowned with the "Chuan" trademark. Its process is complex and unique. The production process includes six major stages and 77 processes such as primary processing, fermentation, aging, blending, molding, and drying. It takes about 9 months from picking fresh leaves to pressing into tea bricks. Among them, pile fermentation and pressing techniques are its biggest features. The finished product is green-brown in color, the soup is amber in color, and the taste is mellow. It has the effects of removing stagnation and greasiness, reducing fat and controlling sugar. Long-term drinking can control fat and sugar and maintain good health. Centennial skills inheritance. The exploration and development of green brick tea is the most difficult process. After experiencing the development and evolution of various forms such as loose tea, ball tea, pillar tea, hat box tea, cake tea and brick tea, the production process of green brick tea has been explored and accumulated in the long-term border tea trade experience. The drink of life for the grassland people. Historically, Changshengchuan green brick tea has always been the main circulation commodity exported to Russia and Mongolia. It was transported to European countries through Kyakhta and St. Petersburg and became the "Oriental Leaves" widely praised by European society. Tea of national unity. Green brick tea is a necessity for the northern ethnic minorities, a carrier and bond of national unity, and a medium for communication with Mongolia, Russia and European countries. It still undertakes the important mission of economic and cultural exchanges and promoting the construction of the "Belt and Road". Green brick tea is also one of the raw materials for "Mongolian milk tea". Since the Ming and Qing Dynasties, it has been an essential drink for people of all ethnic groups in Northwest China. It is also a medium of communication with Russia and other European countries. It still shoulders the important mission of economic and cultural exchanges and promoting the construction of the "Belt and Road".