Objective To explore the effects of pelvic floor electrical stimulation (PES) on constipation in patients with spinal cord injury (SCI). Methods 40 patients with SCI were randomly divided into conventional group and PES group with 20 patients in each group. The conventional group was treated with health education, psychological care, diet care and massage. The PES group was treated with PES in addition.They were assessed with symptoms of constipation and efficacy assessment score. Results The symptoms of constipation and efficacy assessment score decreased significantly in the PES group (P<0.001), but not in the conventional group (P>0.05). And the score was lower in the PES group than in the conventional group (P<0.01). Conclusion PES can help eliminate constipation in patients with SCI.