Deleuze and Adorno are two of the most influential thinkers in the twentieth century, especially in the post-war period. The book is a comparative study of their philosophies. It focuses on the ways these two radically different thinkers attempt to break away from the primacy of identity and pursue freedom and the new. This attempt is the common logic of difference shared by them. On the other hand, such a logic of difference is expressed in two opposite ways: Deleuze's positive constructivism and Adorno's negative dialectics. The irreconciled opposition is present in every respect of their theories. The book aims to reveal the similarity and the difference between the two thinkers, and then examine the root that causes the similarity and the distinction. The contrast is helpful to deepen the understanding of the concept of difference, and should be instructive for those who are interested in Deleuze or Adonor or postmodern culture.