Abstract:IgA nephropathy (IgAN) is one of the most common types of chronic glomerulonephritis, but the definite etiology and pathogenesis of IgAN are still unclear. IgAN is related to a variety of potential mechanisms, among which mucosal immune response is one of the important pathogenic factors. However, IgA protease and cytokines produced by microorganisms can cause corresponding histological changes via immune pathways. At present, the microbial diversity is considered to be closely related to the efficacy of clinical treatment and prognosis of IgAN. With the increasing researches on related pathogenic mechanisms, the clinical data of IgAN treatment have been on the rise as well. Therefore, exploring the microbe-related immune mechanisms in IgAN is of great significance for the effective treatment of IgAN.