Introduction to porcelain: Many late relics from the Tang and Song Dynasties were discovered in the tombs, such as refuge caves, ditches, copper coin cellars and other relics. Porcelain such as bowls, plates, plates, dogs, tiger pillows and so on were unearthed. , as well as copper coins, bronze mirrors, iron cauldrons, iron knives and other relics. Most of the unearthed relics belong to the Song and Yuan Dynasties.