This essay targets to examine the legend of Huangti forging the mirror found in Gujingji (Tales of Ancient Mirrors), in order to argue that the text does not come from the legend system of Hunagtineizhuan (Inner Biography of Hungti) where “Huangti (the Emperor) met Huangmu (the Queen) at Wangwu Mountain in order to mold twelve mirrors,” as quoted in Zheng Gao's Xiwujiyuan (The Origin of Things) during the Southern Song Dynasty. Moreover, it is not related to Xuanzhungji, which holds that “Yunshou was said to make a mirror, in any sense; instead, it employs and adapts from the legend of the “Huangti molded mirror in order to match the calendar”, which serves as the foundation for the story. After closes interpretation of the legend and metamorphosis concerning calendar making in the Sixth Dynasty and comparing it with the legend concerning the making of ancient mirrors that was popular in the Tang Dynasty, it is discovered that Gujingji was not influenced by the many legends concerning the ancient mirror that were popular in Tang Dynasty; moreover, its direct connection with the “Huangti molded mirror in order to match the calendar” becomes obvious. Further, regarding the study of the system of gujing (ancient mirror) and its implications, although Du Wang was situated in the Sixth Dynasty, in which they thought “everything antique is demonoic”, it is explainable for him to regard the “ancient mirror” and “demon” countering each other. However, he incarnated the ancient mirror with autonomy. In addition to its differences from the early Tang thinking concerning demons, it is different from the Taoist physical view of mirror making, constituting contradictory and spectacular thinking patterns.