Background:Criteria for determining brain death (BD) vary between China and the United States.We reported the results of an investigation designed to compare procedures to determine BD in two countries.Methods:The latest criteria in the United states were published in 2010.The latest criteria in China were published in 2009.We used these two types of BD criteria to evaluate patients who were considered to be BD.The time,cost,and accuracy of the diagnosis were compared.Results:From January 1,2012 to October 8,2013,there were 37 patients which were applied for BD evaluation in the Neurological Intensive Care Unit of Beijing Tiantan Hospital.The cause of coma were known as subarachnoid hemorrhage (18 patients,48.6％),intracerebral hemorrhage (8 patients,21.6％),cerebral ischemia (9 patients,24.3％),brain stem tumor (1 patient,2.7％),and intracranial infection (1 patient,2.7％).The clinical examinations were done for all of the patients except 1 patient who had low blood pressure.Three patients had brainstem reflexes that were excluded from BD.Twenty-five patients had apnea tests,and 20 tests were completed that were all positive.Confirmatory tests were completed differently:Transcranial Doppler (30 patients,positive rate 86.7％),electroencephalogram (25 patients,positive rate 100％),and somatosensory evoked potential (16 patients,positive rate 100％).Thirty-three patients were diagnosed BD by criteria of the United States.Only 9 patients were diagnosed BD by Chinese criteria.The use of time and money in the USA criteria was obviously fewer than those in Chinese criteria (P =0.000).Conclusion:Compared with BD criteria of the United States,Chinese criteria were stricter,lower positive rate,more cost in money and time,and more reliable by families and doctors.