Abstract: Bariatric surgery is an effective method for the treatment of obesity and type 2 diabetes mellitus. Morbidly obese patients usually have metabolic syndromes, as such, surgeons need to choose the reasonable surgical methods for patients according to their individuality and particularity. Hiatal hernia is a very common disease prevalent in obese patients and could induce gastroesophageal reflux, which increases the difficulty of bariatric surgery and proposes higher demands on choice of surgical methods to surgeons. It is important to recognize the presence of the hiatal hernia preoperatively and choose a more effective procedure of bariatric surgery to decrease the incidence of postoperative complications.