Aristotle is a Greek philosopher and polymath,a master of the ancient Greek literary criticism and literary studies.Unity idea is one of his important literature criticism thoughts which were put forward in Poetics.The Magic Barrel is Bernard Malamud’s famous short story.By the conception of unity,this paper analyzed the different components in The Magic Barrel and talked about the unity from the writing approach aspect. It’s helpful for us to have a better understanding about how the author reveals the theme and how the author achieves the unity in the story. Aristotle is a Greek philosopher and polymath, a master of the ancient Greek literary criticism and literary studies. Unity idea is one of his important literature criticism thoughts which were put forward in Poetics. The Magic Barrel is Bernard Malamud’s famous short story. The conception of unity, this paper analyzed the different components in The Magic Barrel and talked about the unity from the writing approach aspect. It’s helpful for us to have a better understanding about about the author reveals the theme and how the author achieves the unity in the story .