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目的：探讨经腹、经会阴超声对前置胎盘诊断的差别及价值。方法89例经产科证实为前置胎盘者，其产前经腹、经会阴超声检查结果对照分析。结果与产后诊断比较，经会阴、经腹超声对前置胎盘诊断的符合率分别为96.6%、83.1%；假阳性率分别为2.2%、10.1%；假阴性率分别为1.1%、6.7%，两者相比均P＜0.01。结论经会阴超声诊断前置胎盘优于经腹部超声，且安全、简便、重复性好，具有较好的临床价值。“,”Objective To investigate the difference and value of transabdominal and transperineal ultrasonography in diagnosis of placentaprevia. Methods 89 cases of placentaprevia were confirmed by obstetrics, the contrast analysis of antenatal checks the result with transabdominal and transperineal ultrasonography. Results Compared with postnatal diagnosis, the coincidence rate of transperineal and transabdominal ultrasonography was 96.6%and 83.1%;false positive rate was 2.2%and 10.1%;false negative rate was 1.1%and 6.7%(P all<0.01). Conclusion Transperineal ultrasonography is superior to transabdominal ultrasonography in the diagnosis of placentaprevia, and even safe, and simple with good repeatability and high clinical value.