Objective:To analyze the risk factors on soft birth canal laceration in normal delivery and discuss the reasonable prevention and control measures.Methods:A follow-up study among the mothers, who delivered vaginally at our hospitals during 9-12 months in 2014, and investigate the risk factors on soft birth canal laceration.Results: In this study, the incidence of soft birth canal laceration in normal delivery was 66.12%, by the single factor unconditioned Logestic regression analysis found that emergency birth, primiparity, pregnancy induced hypertension syndrome, macrosomia, malposition, the short gel time, turn the hips to the fore, rotary fetal head, obstructed labor, oxytocin, cervical inflammation, obstetric forceps'application 12 factors were associated with soft birth canal laceration; On the alpha=0.05 level, multiariable unconditioned Logistic regression analysis showed seven factors: emergency birth, macrosomia, malposition, turn the hips to the fore, rotary fetal head, oxytocin, obstetric forceps'application. Conclusion: Emergency birth, macrosomia, malposition, turn the hips to the fore, rotary fetal head, oxytocin, obstetric forceps'application, the seven factors were closely related to the occurrence of soft birth canal laceration, corresponding measures should be taken to reduce and control the incidence of soft birth canal laceration effectively.%目的：分析产妇自然分娩时软产道裂伤的危险因素，探讨其合理的防治措施。方法：选取428例自然分娩的产妇，采用飞利浦HD11 XE彩色声像仪进行腹部彩超检查，对其软产道裂伤的危险因素进行调查。结果：研究显示，软产道裂伤的发生率为66.12%，经单因素非条件Logestic 回归分析发现，急产、初产、妊高征、巨大儿、胎儿方位不正、拨露时间短、臀位后出头、手法回转胎头、阻塞性分娩、催产素、宫颈炎症水肿以及应用产钳12个因素与软产道裂伤的发生相关；多因素非条件Logistic回归分析，在α=0.05水平上共入选7个因素：即急产、巨大儿、胎儿方位不正、臀位后出头、手法回转胎头、催产素以及应用产钳。结论：临床中急产、巨大儿、胎儿方位不正、臀位后出头、手法回转胎头、催产素以及应用产钳7个因素与软产道裂伤的发生密切相关，应采取相应的防治措施，有效地减少和控制软产道裂伤的发生率。
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