沙特是一位多產作家，其作品包括小說、戲劇、散文、傳記或哲學論述。他的存在主義在二次大戰後的法國獨占鰲頭無人能比。主張作家要透過作品對當代社會、政治事件表態，是力行此一「介入」理念的知識份子代表。但沙特的政治立場與實踐往往與他的哲學基本理論有所矛盾，兩者之間可以得到平衡嗎？研究沙特存在主義的論述已經很多，今天我們要以歷史學家的角度來剖析沙特思想的其他面向。

Sartre was a prolific writer of novels, dramas, essays, biographical or philosophical essays. His existentialism was the most prominent school of thought in France after World War Ⅱ, contending that writers were supposed to express their opinions about the contemporary society and political events through their works. Sartre was the representative intellect who actually practiced such an idea of participation. But while Sartre's political position and practice often contradicted the fundamental theories of his philosophy, could the former be in balance with the latter? There have been abundant researches Sartre's existentialism, and this paper is to analyze other aspects of Sartre's thought from the perspective of an historian.