本篇論文旨在研究費滋傑羅小說《大亨小傳》中的主角蓋茲比。美國文學經典《大亨小傳》被廣泛認為是美國文學「失落的一代」的代表。這本著作描述美國一九二零、三零年代的美好時光。透過三個主要角色：蓋茲比─黛西─湯姆之間的故事，展現彼時期最燦爛輝煌亦最墮落的樣貌。 本論文第一章將提供關於「失落一代」的歷史背景及費茲傑羅與其作品之間的關係介紹。第二章以主角之一的蓋茲比為軸，除了探究蓋茲比的美國夢，也分析彼時期人們的美國夢，批判「失落一代」的主要社會價值觀。第三章則以精神分析觀點分析《大亨小傳》中四個主要角色，進一步探究各角色面對美國夢的精神變化與境遇。第四章則是針對不同層次的社會變革，探討其在各種意義上如何影響一九二零、三零年代人類。 最後，在最後一章中，將重述前幾章討論的主要思想。透過《大亨小傳》，我們可以了解到，費滋傑羅鼓勵人們在人生的起伏中尋求一些智慧。 ;This thesis aims to investigate the protagonist, Jay Gatsby, in F. Scott Fitzgerald’s novel The Great Gatsby. The timeless classic The Great Gatsby is widely considered to be a representative of the “Lost Generation” of American literature. The novel describes the good time of the United States in the 1920s and 1930s. Through the narrative of the complex relationships among the three main characters, Gatsby, Daisy, and Tom, it shows the most splendid and the most degenerate appearances of the period. Chapter I will provide an introduction to the background and history of the “Lost Generation” and the relationships between Fitzgerald and his works. Chapter II will be focused on Gatsby, the protagonist. It will not only study Gatsby’s American dream, but also analyze the American dream in that period. Through looking at the origins and development of the American Dream, the main social values of wealth and class issues of the “Lost Generation” will be criticized. Chapter III will closely analyze the four main characters from the perspectives of psychoanalytic theory, and further explore the spiritual changes and circumstances of the four roles in facing the American Dream. In Chapter IV, discussions of social changes at different levels will demonstrate how they affect human beings during 1920s in some sense. In the concluding chapter, the main ideas discussed in the previous chapters will be restated. Through The Great Gatsby, we learn that in spite of some flaws in Gatsby’s character, Fitzgerald still encourages people to reach for some wisdom in the ups and downs of life.