Quranic researchers have long scrutinized the issue of clearly established uses and obscure ones as atenet in interpretation and Qur'anic sciences, This issue established by Quran itself, has been elucidated by traditions, followed by exegetes' explanations abaut it. In this article, this subject is considered literally, in the traditions and Qur'an, resoluing that essentially, Qur'an from one aspect has general obscurity and exactness (tashabuh and Ehkam), from another aspect it has them partially. It also indicates that these two con be devided to different categories. Considering its qualities, the obscure uerses should have more than one aspect: various possible meanings or denotations, among which only some might be correct, while others being incorrect in a way that sick hearted persons may misuse them. At the mean time the ambiguity of such verses may be resolved by referring to the exact and clearly established verses.