Abstract:Appraisal theory is the new development of the research of interpersonal meaning in Systemic Functional Linguistics.Literacy criticism is a means to demonstrate,analyze and appreciate literacy works,and most experts,scholars analyze these literacy works from the perspective of literacy criticism,using the three subsystems of appraisal theory—attitude,engagement and graduation.In this paper,the author tries to demonstrate that in appreciating English literacy works,how readers should use appraisal theory to make value judgments and put forward unique and special viewpoints,thus becoming the real subjects of reading and forming the good reading habit of thinking independently and appreciating literacy works independently.