This article discusses the idiomaticalization of ”Shi Shuo Xin Yu” from combing discourses, society and idioms. We will focus on the interaction and co-construction both within language and society. From the discussion of idiomaticalization, we found the use of idioms can pass through different times and places. The mechanics of idiomaticalization are related with the characteristics of Chinese, such like syllable rhythm, story enlightenment strategy, and they also are related with the universal grammar, such like simple symbolic meaning, lexicalisation guidance, and analogy effect. In the end of this article, we attempt to have our research results about idiomaticalization of ”Shi Shuo Xin Yu” applying to idiom teaching which will enable our research become more practical.