Objective To compare the postoperative anorectal pressure after procedure for prolapse and hemorrhoids (PPH) and Milligan-Morgan hemorrhoidectomy (MMH) in treatment of patients with mixed hemorrhoid of Ⅲ-degree. Methods In total of 112 patients with mixed hemorrhoid of Ⅲ-degree who underwent PPH (n=60) or MMH (n=52) in The First Affiliated Hospital of Xinjiang Medical University between March 2014 to March 2015 were prospectively enrolled, the type of surgery was according to patients’ individual choice. In 6 months after operation, all patients under-went the examination of anorectal manometry which including rectal anal inhibitory reflex, rectal resting pressure, anal resting pressure, maximal anal contractive pressure, and anal canal length of high pressure belt. Results In 6 months after operation, the positive rate of rectal anal inhibitory reflex 〔88.3% (53/60) vs. 61.5% (32/52)〕 , anal resting pressure 〔(56.42± 2.25) mm Hg vs. (46.31±2.58) mm Hg〕, and anal canal length of high pressure belt 〔(3.35±0.12) cm vs. (2.29±0.23) cm〕 of PPH group were all significantly higher than those of MMH group (P＜0.05), but there was no statistical significance between PPH group and MMH group in rectal resting pressure 〔(5.51±1.26) mm Hg vs. (5.39±1.85) mm Hg〕 and maximal anal contractive pressure 〔(156.64±9.78) mm Hg vs. (155.32±8.53) mm Hg〕, P>0.05. Conclusion PPH and MMH are all effective to treat mixed hemorrhoids of Ⅲ-degree, but PPH is more positive in protection of anal function.