Poetics by Aristotle sets the dogmas for literature, while Waiting for Godot, the representative of the Theater of the Ab?surd, violates the former's principles to achieve certain effects. The thesis will analyze the violation from the angle of Solidity or Authenticity of art and poetry, which are the likelinessandnecessity, and credibility. By digressing from the traditional rules, Wait?ing for Godot helps to create absurdity reflecting the inner loss of people after the war and to form a sense of alienation from reality .