The *Brief Report on the Investigation of the Yangjiaoshan Ancient Kiln Site in Yixing* dates the Yangjiaoshan ancient kiln site as: "The upper limit is no earlier than the mid-Northern Song Dynasty, flourishing in the Southern Song Dynasty, with the lower limit extending to the early Ming Dynasty."[1] Gu Jingzhou, in his essay "An Overview of Zisha Pottery History" from *Appreciation of Yixing Zisha Treasures*, adopted this viewpoint. "Regarding the firing period of the Yangjiaoshan kiln site, the report at that time dated it to the Song Dynasty, but this view has been subject to considerable controversy in academic circles."[2] Based on analysis of archaeological material evidence and research reports in recent years, most scholars currently believe that the early zisha specimens excavated from the Yangjiaoshan zisha kiln site should date to around the mid-Ming Dynasty. Some researchers like to cite Song Dynasty poems in their articles, such as "Small stones and cold springs preserve the early flavor, purple clay new wares brim with spring's splendor" (Mei Yaochen), "Delighted to chant and drink together with purple cups" (Ouyang Xiu), and "Pine wind and bamboo stove, lifting the pot to call to one another" (Su Shi). They equate the concepts of "purple clay," "purple cups," and "pot" in these poems with today's "zisha" or "zisha teapot," using this to prove the viewpoint that the origins of zisha began at least from the Song Dynasty. These seemingly solid arguments have now also been questioned by some scholars. In fact, as early as 1979, --- [1] Ci Xizhu: "Distinguishing Early Discoveries of Zisha Pottery," *Yixing Zisha*, Issue 1, 2007, p. 20 [2] Huang Xingnan, ed.: *Collection of Ancient Ceramic Specimens from Yixing Kilns*, Yixing: Office of the Yixing Cultural Relics Management Committee, 2014 edition, p. 99