This paper makes a contrastive analysis of English and Chinese connective devices from the perspective of discourse in order to reveal the differences and explore the causes. The contrastive analysis shows that the main difference between English and Chinese discourse connection is that English has more explicit connection, while Chinese has more implicit connection. This difference reflects the different cognitive styles of Chinese and Western nations, that is, English emphasizes hypotaxis while Chinese emphasizes parataxis; The differences in cognition reflect the characteristics of Chinese and western national thinking, which is rational or perceptual; The differences in thinking are ultimately due to the differences between Chinese and Western cultures and the breeding environment.