Using dialectics to break "absolute truth", Pirandello knocked the bell which implied the premier show of the absurdism. In one of his most famous play Henry IV, the strategy combined the form of comical and grotesque manner is manipulated, while the disquiet of human being and the tragic connotation regarding introspection of the era arc interpreted. The contradiction between formalism and content is embedded by thematic play within play, and this leads dialectical unification of plot and motif form and content. In addition, the aesthetic affectivity accomplished by alternation of identification and dissociation inspires the introspection of audience. The multi-levels of the dialectical manners make the profound philosophical implication hidden under the appearance of melodrama, the frame of comic, the connotation of tragedy. All of them allow various audiences receive different experiences. Finally, the real intention behind the relativism which Pirandello appealed consecutively is to protect human dignity under different live situations. The tolerance revealed in his play makes Pirandello transcend not only to be a philosophy writer solely, but also exceed the absurdity.