1. Establish an IgAN cohort collaboration group and expert committee to carry out registration research. 2. Construct IgAN structured data set standards, formulate structured data collection templates of diagnosis and treatment , and establish multi-center data integration systems on this basis. 3. Establish a standardized IgAN database for combined Hospital Information System and the big data platform of the Medical Federation. 4. Develop IgAN database managements and open standards for data sharing, and carry out high-quality clinical or basic research.