Huangdao Kiln in Jiaxian not only fired white glaze, yellow glaze and black glaze porcelain, but also successfully mastered the technical products of two-color glaze since the Tang Dynasty, such as black glaze blue dot device or applying blue dot color on white glaze, which formed the unique style of the kiln products. Especially since the late Tang Dynasty, jia county Huangdao Kiln Dayaodian Kiln and Yuzhou Zhaojiamen Kiln appeared "rain-like" mottling of kiln transformation, which initiated the process of kiln transformation in Song Jun, so some people called this mottling "Tang Jun". After hundreds of years of development, Jun porcelain has its unique technological characteristics and style. Jun porcelain kiln transformation art is superior and has a high reputation. The successful firing of Jun porcelain copper red glaze is a great creation of working people in ancient China, which has written a glorious chapter in the history of ceramic arts and crafts development in China.