Abstract: Eugene O’Neill（1888-1953）is an American dramatist. His plays have reflected the charm of traditional tragedy is with sincere and deep passion, and has won him a world-wide reputation. He is the first American playwright to win the Nobel Prize in Literature. Long Day's Journey into Night, with the theme of family life, describes the story of an Irish family of which the members are always quarrelling with each other, and always feel contrite after that. The thesis will explore tragedy roots and mysterious elements of the play from the writing background, technique expression and artistic value.

Key words: Eugene O'Neill; Long Day's Journey Into Night; tragedy roots; mysterious elements

摘要：美国戏剧家尤金·奥尼尔（Eugene O'Neill,1888-1953），他的作品体现出传统悲剧剧作所具有的魅力，具有真挚和深沉的激情，为他在世界范围内赢得声誉，并成为第一个获得诺贝尔文学奖的美国剧作家。《进入黑夜的漫长旅程》这部作品，以家庭为题材，讲述的是一个爱尔兰家庭的故事，剧中的一家总是在彼此抱怨，互相争吵，却追悔莫及。本文将结合作者写作背景、表现手法以及艺术价值等着重对该作品中体现的悲剧根源以及神秘元素进行探析。

关键词：尤金·奥尼尔；《进入黑夜的漫长旅程》；悲剧根源；神秘色彩