With the improvement of living standard and dietary changes,metabolic dysfunction-associated steatotic liver disease(MASLD)has become one of the most common chronic liver diseases worldwide.Studies have shown that alterations in gut microflora are associated with the metabolic syndrome,and MASLD is regarded as a manifestation of metabolic syndrome in the liver.In recent years,it has been found that small intestinal bacterial overgrowth(SIBO)is closely related to the development of MASLD.SIBO can contribute to MASLD by disrupting the intestinal mucosal barrier through the gut-hepatic axis,and by altering the intestinal microbiota and its metabolic products.This article reviewed the advances in research on SIBO and MASLD.