It is believed that zhuǎn-zhù and jiǎ-jiè have not been used in forming Chinese characters. According to Li Mu, a Chinese poet in Tang Dynasty, ”jiǎ-jiè means using one sound or word in a numerous ways for different meanings. As time goes along, however, different shapes or pictographic symbols were added for displaying different meanings. Those characters with the added shapes or symbols then were termed as xíng-shēng characters. This paper claims that Chinese characters experienced a process of transformation-first from jiǎ–jiè to zhuǎn-zhù, then from zhuǎn-zhù to xíng-shēng. This process, as a matter of fact, is a critical formula in forming Chinese characters, and has its tremendous contribution in increasing the number of Chinese words. To support this presumption, this paper starts with ”the Theory of yòu-wén”, and then uses the word ”lún” as an example. To conclude, jiǎ-jiè and zhuǎn-zhù play indispensable roles in the formation of Chinese character system They also have their significant contributions to the evolution of Chinese culture and civilization.