Ulysses is a novel written by James Joyce, an Irish writer in the 20th century. It is regarded as the first work of “stream of consciousness” novels. Since its publication, the researches of scholars have widely focused on the value of the art of "stream of consciousness", but a large number of "deviation" phenomena reflected in the work also have important research significance. This article according to the “deviation theory” put forward by the famous linguist Leach, classifies the use of deviation in Ulysses. Combined with examples to analyze its effect and influence in the story, the essay aims at showing the confusion and numbness of two protagonists in the paralysis of Irish society by showing off technique application in the specific case, and reveals Joyce's hatred and disappointment towards the paralyzed Irish society.