The decorative characters of Chinese letters on ceramics have existed since ancient times. After thousands of years of development, they were not only in great numbers but also were diverse in terms of varieties, especially when it came to the Ming and Qing dynasties of China and the Chosun dynasty of Korea. During both periods of two countries, the decorative characters of Chinese letters on ceramics could record events as well as reflect the society and culture in each: status, dedicated use, yearning and praying. In this writing, by introducing the decorative characteristics of Chinese letters on the Buncheong ware ceramics and the White and Blue porcelains of the Chosun dynasty of Korea, and on the White and Blue porcelains of the Ming and Qing dynasties of China, I conduct a comparative study from the perspectives of the fonts, distribution layout and symbolism. And also I explore that the words written on the ceramics and porcelains give the implicit significances to both of ceramics and porcelains themselves.