The prepared dna electrochemical sensor was used to determine the nature and quality of complementary dna of standard concentration . then the dna sensor was used to diagnose the clinical blood sample containing hepatitis b virus 利用制成的dna电化学传感器对溶液中标准浓度的互补dna进行定性和定量检测,并在此基础上,将dna传感器用于临床乙肝病毒血清的dna诊断。