Register theory is one of the most important theories of systemic functional linguistics,which is concerned with the vari-ables of field,tenor,and mode,and is a useful abstraction which relates variations of language use to variations of social context.Bilingual dic-tionaries contain as adrule in the front matter systematic categorization and detailed description of register labels.This paper attempts to analyze the register labels in bilingual dictionaries and discuss the problems existing indregister labeling.