Principle of ‘not creating but following tradition(述而不作)’ has been established from the incipient stage of the People’s Republic of China, being cheered by the Scholars who supported Simplification of Chinese Characters, as well as people’s requirement. ‘Not creating but following tradition’ refers to the fact that Simplified Chinese Character (簡化字) does not spoil the convention and culture of traditional writing, being composed on the basis of ‘Popularized Characters (俗字)’, ‘Ancient writing (古字)’, ‘Cursive script (草書)’. Taking notice of this fact, under the preposition that at least partly all Simplified Chinese Characters has inevitably been influenced by a definite traditional composition principle, this essay is to review 12 Simplified Characters covering 11 Chinese character components (偏旁) in total. All the 11 character components display function of phonetic complement (聲符) in Pictophonetic Characters (形聲字), corresponding to 12 Simplified Characters in all. To conclude, it is approved that 11 Phonetic-Complements (聲符偏旁) of 12 characters reveal traditional composition formula.