Because Jianzhan is a porcelain tea set, it belongs to Class 21 trademark. Jianzhan is a kind of tea set, which belongs to the porcelain category. The classification of trademarks is divided according to the goods or services involved. The Chinese trademark classification is divided into 45 categories, of which category 21 is specifically for ceramics. products. Therefore, classifying the trademark Jianzhan as a Class 21 trademark is in compliance with the trademark classification regulations.