The analysis approximates "The Theoretical and Applied Critique of Shams Al-Din Al-Nawaji (d.859 AH)" through the inspection of the contents of his book "Introduction to Writing Poetry and Prose" to explain the stylistic directives, artistic remarks, critical directions, and sectarian branches in it.The study commences from the introductory identifiers: (the Critic, the Book, and the Method), extending to the inductive etymologizing treatment, within five sections, including, (the terminology, the basics, the positions, the trade-offs, and the judgments), also including the sub-approaches of the chosen examples to explain the objectives of the critic in the making of composition and prose.The axes of analysis meet on the methodological scientific principles by adopting description in the preludes, the deduction for critical analyzes, and the induction within the overall results, while employing the historical approach to elicit evidence to illuminate the origins and branches.The research concluded with the limiting of the aforementioned basic monetary framework through the theorizing, representation, and analysis according to the conscious representation, of the previous critical heritage. This can be done by analyzing the pivotal critical concepts. Such as, (poetry, refinement, strengthening rhymes, mastering disposition, mastering opening verses, assonance, eloquence, and articulation). Also, by clarifying the principles in, (poetry, prose, and creativity), in addition to clarifying the self-critical attitudes towards, (articulation and meaning, plagiarism, building poetry and prose, the old and the new, and the column of poetry), and making critical comparisons according to (openness, closure, and determination), while focusing on the latter pattern, and declaring critical rulings, (reasoned, unreasoned, and generalized), while focusing on the reasoned rule..