Thyroid associated ophthalmopathy(TAO)is an autoimmune orbital disease.Currently,Clinical activity score(CAS)is mainly used to evaluate the activity stage of patients.Accurate staging plays an important role in accurate treatment.However,CAS score is highly subjective,and a more objective method is needed to improve the accuracy of activity assessment.Therefore,this paper reviews the application value of common magnetic resonance imaging sequences in the activity assessment of TAO.