Objective To discuss the relationship and clinical significance between anterior rectocele and resultant constipation by the obstruction of functional outlet. Methods The clinical and dynamic defecography materials of 417 cases with resultant constipation by the obstruction of functional outlet were retrospectively reviewed. Dynamically replaying the cases of anterior rectocele and analyzed the representation. Results ①310 cases with anterior rectocele,392 cases with internal rectal prolapse,353 cases with perineum descending,69 cases with pelvic spasm or puborectalis thickening. 95.20% (397/417) cases with more than 2 abnormalities simultaneously,no cases with only anterior rectocele. The difference between men and women was statistically significant(P< 0.01) of anterior rectocele,perineum descending、pelvic spasm or puborectalis thickening. There was no difference with internal rectal prolapse(P> 0.05). ②Dynamically replaying the cases of anterior rectocele:226 cases could drain almost all of the barium of rectum and the distal rectum mucosal fold hypertrophy,account for 72.90% (226/310);71 cases could not drain any or drained driply and prolapse of rectal mucosa or pelvic spasm or puborectalis thickening,account for 22.90% (71/310); 13 cases with protruded sac reduced not obsolete and rearward the sac internal rectal prolapse, account for 4.20% (13/310). Conclusion Anterior rectocele is not the main cause of constipation,to make sure the relationship between anterior rectocele and resultant constipation by the obstruction of functional outer can provide instructional significance for the cure scheme.