As the spokesman of the Jazz Age,F.Scott Fitzgerald presents readers a panoramic view of the 1920s American life with his publications.Considered as his best-written book and the most widely read one,the success or greatness of The Great Gatsby,to a large degree,owes to the protagonist–Jay Gatsby.Through a brief literature review,this paper mainly focuses on the analysis of the greatness of Gatsby from three aspects-the consummate hero of intense will and belief,the notion of"Appearance made Real"and his endeavors in the pursuit of spiritual values.