Seven is an auspicious number in China, and as a symbol of many children and many blessings, Qizi has been deeply rooted in the hearts of the people in Nanyang. In fact, the regulation of the seven sons began in the Qing Dynasty, and the Case of the Qing Dynasty Code contained: "In the thirteenth year of Yongzheng (in 1735 AD), Yunnan merchants made tea every seven yuan, weighing forty-nine taels (3.6 Jin today), and each kilogram was given a citation, with 32 barrels of tea as a citation, and each citation was given two points of tax silver San Qian. From the beginning of the thirteenth year, it was awarded to Tea Yin3,. " Here, the Qing dynasty stipulated that Yunnan Tibetan tea was Qizi tea, but there was no such formulation at that time.

at the end of the Qing dynasty, due to the variety of "shapes" of tea, such as the appearance of small round tea with five sons in Baosen Tea House, for the sake of distinction, people called the packaging form of round tea with seven sons as a tube, but it was not a commodity or trademark name. At the beginning of the Republic of China, faced with the confusion of the weight of tea cakes and the pressure of competition, some regions set up tea chambers of commerce in an attempt to unify them. For example, the Simao Tea Chamber of Commerce agreed in the decade of the Republic of China that the base material of each round of tea should not exceed 6 taels, but the "Lei Yongfeng" with deep pockets and political background produced "eight-round" tea with 6 taels of money per round and 8 taels per barrel. Under unfair competition, the market share increased greatly for a while.

after liberation, the tea industry was state-owned, and the tea factories affiliated to Yunnan Tea Company produced "China Tea Brand" round tea with the trademark of China Tea Company. The service life of the trademark is from March 1, 1952 to February 28, 1972. Therefore, in the early 197s, Yunnan Tea Import and Export Corporation hoped to find a name that was more appealing and more conducive to publicity and promotion. They changed "Yuan" to "Cake" and formed this auspicious name "Qizi Cake Tea". Since then, the Chinese tea brand has faded out, and the title of round tea has also withdrawn from the stage, which has made Qizi cake the dominant position of pressed tea.

"seven circles and one cylinder" was originally a standard formulated by the Qing dynasty to standardize measurement and production and transportation, and it only played a normative role in the early and middle Qing dynasty and the planned economy era after liberation. Once entering the liberalized market, besides brand value, the meaning of quality and weight it represents will be blurred. Four-year-old tea and Five Blessingg tea are already available. It is difficult to guarantee that there will be no tea products such as Eight-year-old tea and Nine-Palace tea in the future. It is worrying how long the banner of Qizi cake can float. ,