Lu Xun's literary criticism advocated against the criticism of facts and metaphysics. Fact-based criticism refers to a specific analysis and description of the shortcomings or shortcomings of a specific work or character, not involving the overall evaluation of the work or character. Metaphysical criticism, on the other hand, refers to the general evaluation of works or characters from one-sided and isolated problems without specific analysis and practical basis. Lu Xun believed that the matter-of-fact-style criticism was easy to fall into trivial details and could not dig into the inner meaning and value of the works; while the metaphysical criticism was easy to ignore the overall background and context of the works or characters, resulting in a one-sided understanding and evaluation of the works or characters. Therefore, Lu Xun advocated a comprehensive, comprehensive, and in-depth criticism of works or characters, opposing a single, partial criticism.