Xuande furnace is mostly cast at the bottom of the furnace, and there are seven kinds: one word, the word "Xuan" in seal script; The word "Xuande" in regular script or seal script; Three words, horizontally "Xuande Year"; The four-character "Xuande Year System" is divided into flat printing, round printing, Ssangyong four-character printing and Ssangyong column printing. Six words, "Daming Xuande Year System"; Eight-character model, "made by Wu Bangzuo in the fifth year of Xuande"; Sixteen fields, "Written by Wu Bangzuo, inspector of the Ministry of Industry of Daming Xuande for five years", Fang Yin. Among them, Xuande Furnace handed down from ancient times is with Wu Bangzuo.
According to historical records, Xuande Furnace was cast only once in Xuande three years, with a total of 5,000 pieces, and then it was closed and not cast. Because Xuande furnace is famous all over the world, there are many imitations in later generations, but no matter how it is imitated, its color and copper are far from the real Xuande furnace.