Abstract
The relevance-adaptation theory can be said to be a combination of relevance theory and adaptation theory. It is a kind of cognition of context. Generally speaking, cognition context is a kind of mental cognition, which belongs to a form of mental structure recognition, relating to the knowledge, understanding and relevance of discourse information in this context. This article mainly elaborates the operation mechanism of relevance and adaptation theory and the comparison of relevance of College English Test Band 4 and 6. This can be used as a reference for relevant academic staff.