疯癫形象是文艺复兴时期文学史上独特而普遍的现象。在米歇尔·福柯审美决定论的基础上 ,文章分析了《李尔王》中李尔从国王走向疯癫最终死亡的过程。李尔身份的变化体现了莎士比亚及很多作家在文艺复兴时期 ,通过疯癫和愚蠢来寻求理性和真理 ,从而使社会在文学里达到了内在的和谐与统一。疯癫的审美是文艺复兴时期美学独特的向度 ,而疯癫美学的建立却刚刚开始 The madness is a unique and common phenomenon in the history of Renaissance literature. On the basis of Michel Foucault’s aesthetic determinism, the article analyzes the final death of Lear from kings to madness in King Lear. The change of Lear identity reflects that Shakespeare and many writers seek the truth and truth through the insanity and stupidity in the Renaissance, so that the society can achieve the internal harmony and unity in the literature. The madness of aesthetics is a unique dimension of Renaissance aesthetics, and the establishment of mad aesthetics has just begun