目的：计算盆底器官脱垂患者盆膈裂孔面积截断值及盆膈裂孔面积与盆底功能障碍患疾病的相关性。方法：本研究对178例确诊为盆底功能障碍的女性患者行经会阴实时三维超声检查，对盆膈裂孔面积进行测量，并分析其与器官脱垂患者严重程度的相关性。结果：盆底器官脱垂患者盆膈裂孔面积截断值为25.5 cm2，同时，盆腔器官脱垂患者严重程度、压力性尿失禁与盆膈裂孔面积之间的相关系数分别为0.74、0.45。结论：获得盆底器官脱垂患者盆膈裂孔面积截断值，同时，盆底器官脱垂严重程度与盆膈裂孔面积呈明显正相关。

Objective: To obtain the cut-off value of the area of the pelvic diaphragmatic hiatus and analyze the correlation between the area and the severity degree of patients with pelvic organ prolapse(POP) and stress urinary incontinence(SUI). Methods: One hundred and seventy-eight women diagnosed with pelvic floor dysfunction were examined by real-time three-dimensional ultrasound of the perineum. The area of the pelvic diaphragmatic hiatus was measured, and the correlations of the area and the severity degree between POP and SUI were analyzed. Results: The cut-off area of the pelvic diaphragmatic hiatus in patients with POP was 25.5 cm2. Meanwhile, the correlation values between the severity degree of POP and SUI were 0.74 and 0.45 respectively. Conclusion: The cut-off value of pelvic diaphragmatic hiatus in patients with POP was available and the severity of POP was positively related to the area of the pelvic diaphragmatic hiatus obviously.