Scales play an important role in clinical research of delirium. In addition to being used for screening diagnosis, scales are also used for assessment of clinical features, treatment effect and prognosis. In this article, we introduced scales used for assessment of delirium and reviewed the current situation of research on such scales, including Confusion Assessment Method, Memorial Delirium Assessment Scale, Delirium Rating Scale, Delirium Rating Scale-Revised-98, Cognitive Test for Delirium and the Delirium Motor Subtype Scale.