Figure and Ground theory,stemming from psychology ,is a theory based on the principle of prominence.The theory holds that the separation principle,which is not only a basic cognitive principle of spatial organization,but also a basic cognitive prin?ciple of the conceptual content of language organization.Later,it was introduced into the language research by cognitive linguists such as Tamly,who use it to explain some grammar and language phenomena which has great inspiration for our research .This paper starts with the basic idea of figure-ground theory,namely its linguistic meaning,and then summarizes its application in the field of linguis?tics,especially in syntactic analysis.