Does the subject want to ask, "When was the bottom Jun porcelain of Shenrui Tang Dynasty?" Shenrui Tang Dynasty Jun Porcelain in Song Dynasty. Jun porcelain of Shenrui Tang Dynasty is not from Yuan Dynasty, but a kind of ceramic ware in Ming Dynasty. Jun porcelain, which began in the Song Dynasty, became one of the famous ceramics in the history of China with its natural slight blue glaze and "pit pattern". In the Ming Dynasty, the production of Jun porcelain reached its peak, among which Shen Ruitang was the most famous, known as "the first porcelain in the world". As the name implies, this kind of Jun porcelain was developed on the basis of the slight blue glaze in the Tang Dynasty. Its glaze color is like jade, with natural texture, forming its unique aesthetic feeling. Shen Rui Tang Jun porcelain is collected by museums and private collections.