The soft birth canal includes the lower uterine segment, cervix, vagina and vulva. Lesions in the soft birth canal itself can cause obstructed labor, and lesions in and around other parts of the genital tract can also affect the soft birth canal and make labor difficult, but the former is more common. The obstructed labor due to soft birth canal anomaly is much less common than that due to bony birth canal anomaly, so it is easy to be overlooked and cause missed diagnosis. Soft birth canal anomalies are those in which the uterine orifice, vagina and vulva are tough and not sufficiently extended, making it difficult for the fetus to pass. Soft birth canal abnormalities are mostly due to advanced maternal age and abnormal physical development, so to prevent soft birth canal abnormalities women of childbearing age should seize the best age for childbirth and do preconception checkups during the preparation period. Soft birth canal abnormalities can also cause obstructed labor, so a vaginal examination in early pregnancy to understand the condition of the vulva, vagina and cervix, as well as the presence of other pelvic abnormalities, has some clinical significance. Treatment and care of soft birth canal anomalies: 1. vulvar anomalies 1. if perineum is tough or scarred, lateral perineotomy should be performed. 2. 2, perineal edema, continuous wet and hot compresses with 50% magnesium sulfate (mostly used for prenatal and postnatal). Disinfect the skin and release fluid (mostly used before or during delivery); or make lateral perineal incision (only used during delivery). Vaginal abnormalities 1. Vaginal scar narrowing If the narrowing position is low, unilateral or bilateral lateral perineal incision can be performed during delivery. If the position is high or the scar area is large, a cesarean section should be performed. 2. Congenital vaginal septum The longitudinal vaginal septum can be cut off after delivery. If the diaphragm is low and thin, an “X” shaped incision can be made after delivery, but if the diaphragm is thick and high, a cesarean section should be performed. 3. Vaginal tumor or cyst If found in early, middle and early pregnancy, it is estimated that the fetal head can be obstructed from descending during delivery, the tumor should be removed. If the tumor is found in late pregnancy or at the time of delivery, cesarean section should be performed first, followed by excision of the mass. The excised mass should be sent to frozen section for pathological examination to determine whether further treatment is needed.