The results of the study showed that: the obturator internus muscle did not change anal canal pressure when it was stimulated before the transposition, but caused a significant decrease in anal canal pressure when it was stimulated in the postoperative period; there was no resting electromyographic activity of the obturator internus muscle in the preoperative period, but there was a significant presence of electromyographic activity at 6 months postoperatively, and the anal raphe muscle consisted of skeletal and smooth muscle fibers and the obturator internus muscle consisted of only skeletal muscle, but when the obturator internus muscle was histologically examined at 6 months after the operation, the obturator internus muscle was found to have smooth muscle fibers. Smooth muscle fibers were found to be present. This study suggests that the IOM can partially replace the function of the pelvic floor muscles and that autografting of the IOM via the perineum is feasible in terms of surgical operation. The establishment of a postoperative anal canal dilatation mechanism to counteract the paradoxically contracting puborectalis and external sphincter can relieve rectal emptying obstruction caused by pelvic floor spasm. Surgical steps: (1) The patient takes the folding position after saddle anesthesia, and an incision of about 5 cm in length is made on the left and right sides of the sciatico-rectal fossa at a distance of 1.5 cm from the anal verge. (2) Cut the subcutaneous tissue and the fatty tissue of the sciatic rectal fossa, the operator’s left finger is inserted into the rectum, and the lower edge of the obturator internus muscle can be touched at 2cm above the sciatic node, and the fascia of the obturator internus muscle is incised with a sharp knife under the guidance of the left finger and the posterior and inferior parts of the obturator internus muscle are freed with the blunt-sharp combination method. (3) The free posterior lower portion of the obturator internus muscle and the obturator internus muscle fascia were sutured to each side wall of the anal canal, i.e., sutured between the puborectalis muscle and the deep and superficial layers of the external sphincter muscle, with 3 sutures on each side. Do not penetrate the bowel wall when suturing the puborectalis and external sphincter muscles. Patients with pelvic floor spasm syndrome often have a combination of other constipation-inducing conditions such as anterior rectal protrusion and descending perineum, which sometimes require simultaneous surgical management.