Retrograde jejuno-gastric intussusception is an unusual complication after gastroenterostomy. It is very difficult to diagnosis this illness before endoscopy or operation, so a high clinical suspicion is needed to make the diagnosis .There have been only 300 reported cases of this illness. There are four types of jejuno-gastric intussusception that are defined anatomically. Intussusception of the efferent limb of the jejunum is the most frequent type. Although the causative factors are not well known, this disease has a poor outcome unless it's treats promptly within 48 hours. We report here a case of hematemesis caused by intussusceptum from the efferent limb to the afferent limb of Braun anastomosis.