Functional cognitive disorder（FCD） is a cognitive disorder that includes one or more cognitive impairments with internal inconsistency between subjective and objective manifestations. It cannot be explained by other diseases，but can be coexisted with other diseases，which can or has impaired the patient's social，work，or other vital functions. FCD currently has problems such as terming confusion and unclear concepts. The studies of the disease diagnosis and treatment are still in the initial stage，and more research needed to be performed. This article makes a systematic review of the current concepts of FCD，and the progress or status in diagnosis and treatment，hoping to improve the domestic colleagues' understanding of the disease and provide ideas for the diagnosis，treatment，and research of the disease.