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目的:探讨经阴道超声检测宫颈长度及形态对高危孕妇发生未足月胎膜早破的预测价值。方法:选取温州医科大学附属平阳医院2014年1月至2018年10月收治的高危孕妇150例，根据是否发生未足月胎膜早破分为对照组91例(未发生胎膜早破)、观察组59例(胎膜早破)，对比两组孕龄宫颈缩短、宫颈长度和宫颈呈漏斗状例数的差异，以及不同宫颈长度和漏斗样变特异性、敏感性。结果:观察组孕龄宫颈缩短、宫颈长度和宫颈呈漏斗状例数分别为(16.9±2.1)周、(13.7±6.9)mm和37例(62.71%)；对照组分别为(20.2±2.8)周、(18.3±8.0)mm和40例(43.96%)，两组差异均有统计学意义(n t＝9.268、6.056，χn 2＝5.297，均n P50%的敏感度和95%可信区间分别为43.59%、0.7～7.2。对照组未出现宫颈长度75%，在宫颈长度25%的敏感性、95%可信区间分别为44.29%、0.3～3.8。n 结论:宫颈长度75%是早产的主要原因，对未足月胎膜早破有极好的预测价值。“,”Objective:To explore the predictive value of cervical length and morphology detected by transvaginal ultrasound in the diagnosis of premature rupture of membranes in high-risk pregnant women.Methods:From January 2014 to October 2018, 150 high-risk pregnant women admitted to Pingyang Hospital Affiliated to Wenzhou Medical University were divided into two groups according to whether premature rupture of membranes occurred.In the control group, 91 cases of premature rupture of membranes did not occur.In the observation group, 59 patients had premature rupture of membranes.The differences in cervix shortening, cervical length and funnel shape of the cervix were compared between the two groups.The differences in specificity and sensitivity between different cervical lengths and funnel-like changes were observed.Results:The cervical shortening, cervical length and funnel-shaped number in the observation group were (16.9±2.1)weeks, (13.7±6.9)mm and 37 cases(62.71%), respectively, which in the control group were (20.2±2.8)weeks, (18.3±8.0)mm and 40 cases(43.96%), respectively, the differences were statistically significant(n t=9.268, 6.056, χ n 2=5.297, all n P50% were 43.59% and 0.7~7.2, respectively.In the control group, there was no cervical length75%.The sensitivity of cervical length25% and the 95% confidence interval were 44.29% and 0.3~3.8, respectively.n Conclusion:For cervical length75% has excellent predictive value for premature rupture of membranes, which is the main reason for maternal preterm birth.