The five famous kilns in Song Dynasty are Ding Kiln, Ru Kiln, Guan Kiln, Ge Kiln and Jun Kiln, each with its own characteristics. For example, Ruyao porcelain is mainly celadon, and its color is sky blue. Crab claw pattern, fish scale pattern and incense ash are also the characteristics of Ruyao porcelain. These five famous kilns have made great contributions to China's ceramic industry, and their formation and appearance are the beginning of China ceramics in the history of world civilization.