Objective To investigate the clinical features of Hashimoto′s Encephalopathy(HE).Methods To retrospectively analyze the clinical data of 6 HE patients,admitted in Shanghai Changhai Hospital between 2010 and 2013.Results The age of onset were between 41 and 71 years;the male-to-female ratio was 1:5;the most common manifest was memory loss (5 patients);the ATPO of all the patients were significantly high ,but the test of ce-rebrospinal fluid ,electroencephalography and iconography were all non -specific;all of 6 patients responded well to the steroid therapy .Conclusion HE should be considered in those whose memory deteriorated and ATPO elevated , especially when they were sensitive to steroid treatment .