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目的与方法：报告２０６例胎龄２０～４０周胎儿外耳的超声显像检测。结果：胎儿外耳在孕２０周以后即可清晰显示其形态、大小及位置。胎儿耳廓长径与双顶径呈高度相关性（ｒ＝０．９９３）（Ｐ＜０．０１）。结论：超声显像对胎儿外耳发育状态的检测，能够产前诊断胎儿外耳发育畸形。
PURPOSE AND METHODS: The ultrasound examination of 206 cases of fetus with gestational age of 20-40 weeks was reported. Results: The fetal ear can show its shape, size and position clearly after 20 weeks’ gestation. Fetal auricle length and biparietal diameter were highly correlated (r = 0.993) (P <0.01). Conclusion: Ultrasound imaging detection of the development of fetal outer ear, prenatal diagnosis of fetal ear malformations.