If metaphoric advertisements are observed by separating them into ”metaphor” and ”advertising expression,” we will discover that some metaphoric ads are unique on the metaphor aspect, some on expression aspect, and some on both. Therefore, in an experiment, this study manipulates metaphor and expression styles, and observes how attitude toward advertising (Aad) and advertising persuasiveness change. Results indicate that aptness of metaphor and expression style both affect Aad and persuasiveness significantly. Specifically, presenting an identical metaphor in different styles, Aad and persuasiveness vary. Besides, there is no interaction between metaphor and expression styles, visual design does not change the role aptness of metaphor plays in advertising effectiveness.