By investigation, this thesis thinks that the Iconicity of Chinese exists in all levels such as pronunciation, words and expressions, syntax and so on and analyzes its generative mechanism. The Iconicity of Chinese pronunciation lies in onomatopoeic word, Iconicity of pronunciation and meaning, and tone. First of all, the generation of onomatopoeic word has close relationship with things in the nature. Onomatopoeic word is vivid delineation of external world, shows the sound of nature world and human beings, and reflects the similarity between real world and symbols. Secondly, at the early stage of the generation of Chinese, the pronunciation and meaning of words come from things in the nature. They imitate all kinds of natural sounds and take the meanings of the sounds. The similarity of pronunciation and meaning specifically lies in using same or similar pronunciations to express things that have common characteristics. Finally, the tone of Chinese also shows pronunciation similarity. Tone can not only differentiate semantic meanings, but also reflect characteristics of different things. Chinese is typical ideography. Chinese characters and words have very high Iconicity. This thesis divides the similarity on this level into Chinese characters and compound words, and then has further discussion. According to its coinage principle, Chinese can be divided into pictographic character, self-explanatory character, associative compound character, synonymous character, pictophonetic character and phonetic loan character, and among which, the similarity of pictographic character describing natural world is the highest and the similarity of phonetic loan character, which is totally different from borrowed character pattern and meaning, is the lowest. The similarity of Chinese compound words is mainly reflected in compound words that show coordinating relation, including time sequence, whole-part sequence, center-surround sequence and speaker-centered sequence etc. The Iconicity of Chinese syntax is showed in sequence Iconicity, distance Iconicity, quantity Iconicity and markedness Iconicity. Sequence Iconicity refers to that word order is in parallel with the occurrence sequence of events and concepts in language linear arrangement. And the components of syntax are arranged according to time sequence or space sequence. Distance Iconicity refers to that language sign distance is similar to concept distance and it is mainly reflected in the relationship of modifier and central word. Quantity Iconicity refers to that the syntax components of important, quantified and complicated information are large and the forms are complicated. Markedness is similar to extra meaning. The sequence for markedness to develop from nothing is similar to the natural sequence of cognition, and that’s markedness similarity. Language is reflected through human’s cognition process and its process is objective world→ cognition→ concept→ language form. That’s to say, language similarity is not just about reflecting objective world directly, and the more important thing is to reflect people’s cognition mode on external world. There are rules for people to know the world and these rules will inevitably be reflected on language forms.