Yao Nai Attached great importance to the active effect of imitation, which involves “imitating" and “non-imitating".

The paper is meant, by comparing the generating pattern of onomatopoeias of "perception imitation generation" both in Chinese and English, to advocate that the generation of onomatopoeia is governed by the phonetic and phonological systems of that language.

As an important manner in criminal investigation and solving the cases,imitative portrait becomes more and more important and it already has been an effective measure of striking criminals.