Clean the number of variant in the dictionary be handed down from ancient times, in order to describe the characters of standardization and the transmission condition of Chinese character. Through sorting out the unauthorized character in Song Edition Yupian宋本玉篇, we can find that the development of Chinese characters is a dialectical process: ancient SuTi, today Zheng Ti; today Su Ti, ancient Zheng Ti. The evolution of Chinese characters is from standard to the variation and from the new standard to the variation. Each standard of characters all make characters tend to brief and easy-to-use. The new standard substratum is always the original constraint mechanism. The original constraint mechanism is always adapt to the new development and presents different canonical form.