The narrations of the infallible leaders have an important role in explanation of the verses of Quran. This application and importance is stated in some of verses and narrations. How ever, the author has highlighted 3 Special application of the narrations in this regard.A. Methodological bases and rules of comment of Quran (The important characteristics ofQuran such as guidance, comprehensiveness, internal harmony, multi-facets, its freshness during the centuries, its general and particular meanings, its similar and indisputable verses, rejecting of any allegorical interpretation of the verses, etc;) B. Recognition of the bases of Quranic comment. It explains that a commentator should receive the fundamentals of his (her) religious knowledge framework from the holy Quran and traditions of the infallible leaders, and then begins to comment the holy Quran.C. The role of narrations as a source of interpretation (The occassion of revelation of the verse (s), application of verse in its exact case, removal of superficial contradiction of verse (s), putting extentions to unconditional or general verse (s), explaining the brief verse (s), giving the exact meaning and applicability of the verse (s), interpretation of homolog us verse (s)), terminologic and case interpretation of verses, etc,).