Objective To control the delivery speed of fetal head according to the tension of perineal central tendon, so as to reduce perineal injury and shorten the duration of vaginal-delivery. Methods A total of 520 primiparas who delivered vaginally were divided into an intervention group and a control group chronologically, with 260 cases in each group. In the intervention group, the perineal central tendon tension was used as a standard to control the delivery speed of the fetal head, while the control group relied on the diameter (<1 cm) of the fetal head exposing the external vaginal openning when it was pushed each time. Results There was no degree Ⅲ or Ⅳ perineal laceration in either of the two groups. The rates of perineal laceration or perineotomy, perineotomy with laceration in the intervention group were significantly lower than those in the control group,and the time from fetal head exposing to actual delivery,as well as the duration of second stage of labor in the intervention group were significantly shorter than those in the control group (all P<0.05). Conclusion In unprotected or moderately protected perineal delivery, controlling the delivery rate of the fetal head according to perineal central tendon tension, is conducive to reducing the degree of perineal injury during delivery and improving fetal delivery.