【Abstract】 Irritable bowel syndrome (IBS) is one of the most common functional gastrointestinal diseases in the GI department, manifesting with symptoms including recurrent abdominal pain associated with changes in frequency or form of stools. Besides medication treatments, dietary management has been recommended as an approach. FODMAPs are short chain carbohydrates that are poorly absorbed in the small intestine, including fermentable oligosaccharides, disaccharides and monosaccharides and polyols, such as fructans, galactooligosaccharide, lactose, fructose, xylitol and mannitol. Low FODMAPs diet has been recommended as the firstline approach for treating IBS patients in several countries in recent years. The paper reviews recent progress in low FODMAP diet for treating IBS, including the definition of the low FODMAP diet therapy, its efficacy on the IBS patients, the way how to process it in IBS patients, possible mechanisms, existing problems and the possible ways to predict the efficacy.