In classic and contemporary Arabic grammar texts, noun and verb are independent in expressing meaning and are the two main pillars of speech; But in relation to the letters of the preposition, their meanings are considered dependent and in the best case, they have introduced the preposition as the link between the noun and the verb, but according to the researches of rhetoricians and literary commentators of the Holy Quran, these letters have found a high position in the category of conceptual transformation of phrases. In the Holy Qur'an, as the most prominent book in the field of rhetoric and the greatest holy book of Muslims, there is a wide frequency of vowels, and therefore, a deep understanding of the verses of this divine source is not possible except by understanding the role of vowels in the conceptual transformation of Arabic expressions. The goal of this study is to know the effect of the vowels in the conceptual transformation of the verses of the Holy Quran. This essay, with the analytical-descriptive method and by using the people of classical literature in the field of literary interpretation, seeks to analyze and examine this important role and by giving examples of the verses of the Holy Quran, this conceptual transformation with and without considering This role, Basnajd.