Objective:To observe the efficacy of rehabilitation treatment in patients who have postpartum pelvic floor dysfunction by the perineum ultrasound. Methods: 80 cases of postpartum pelvic floor dysfunction patients were randomly divided into two equal groups. The control group: given regular heath education and postpartum heath care training. The rehabilitation group: given 8 weeks of rehabilitation care at 6 weeks postpartum. Using the ultrasound to have a perineal examination on the two group patients,then respectively obtain the measured value (including the pelvic hole"s area, perimeter,front and back diameter and the left and right diameter)of 6 weeks postpartum(rehabilitation group patients before treatment)and the 14 weeks postpartum (after the rehabilitation treatment group) ,which were in three different states(shrinkage anal, resting and Valsalva maneuver).Comparing differences between the two sets of parameters. Results:Compared with the control group, in rest and Valsalva maneuver states, the area, perimeter, diameter of the diaphragm, and the diameter of left and right sides of the rehabilitation group were smaller ,which were statistically significant (P< 0.05).However, in the state of shrinkage , the parameters mentioned above between the two groups were no significant difference (P > 0.05). Conclusion:The early postpartum pelvic floor rehabilitation treatment can reduce the diameter line of pelvic diaphragm, enhance the recovery of pelvic anatomy and function. Perineum ultrasound is of great clinical signification and it provides a reliable basis for clinical evaluation of the pelvic floor rehabilitation effects.