ObjectiveTo investigate the effect of external dissection and internal ligation, plus partial internal sphincterotomy in the treatment of mixed hemorrhoids. MethodsDuring January 2010 to January 2012, 364 patients with mixed hemorrhoids selected for surgery were divided into two groups based on whether the patients should accept the treatment of partial internal sphincterotomy. We observed the curative effect of the two groups, including anal pain, bleeding, edema, average healing days and the anorectal stenosis after operation. ResultsThere were statistical differences between the two groups in terms of anal pain, complication rate and hospital stay (P<0.01). The curative effect of the group treated with partial internal sphincterotomy was better than that of the other group. ConclustionExternal dissection and internal ligation, plus partial internal sphincterotomy is a better choice in the treatment of mixed hemorrhoids, which can relieve postoperative symptoms, reduce complications and shorten treatment course.