Shang dynasty. 26 cm large porcelain plate is a kind of porcelain, which is the product of ancient China. It evolved from pottery and began in Shang Dynasty. Porcelain plates are common daily utensils, and the basic types are open, shallow-bellied, flat-bottomed, high-legged or round-legged. According to its function, it can be divided into fruit plate, soup plate, tray and so on. According to its shape, it can be divided into sunflower mouth plate, flower mouth plate, flanging plate, etc., mainly round, square or oval.