It is the most common primary glomerulonephritis. Clinical manifestations: hematuria, proteinuria, renal insufficiency, hypertension, etc. The most common manifestation: episodic carnitic hematuria associated with respiratory infection, which usually appears 1 to 3 days after infection and persists for 1 to 3 days before the carnitic hematuria may disappear and turn to microscopic hematuria. Severe manifestations: persistent carnitic hematuria, massive proteinuria, and acute renal failure. Confirmation method: kidney biopsy. Treatment options: depends on the degree of hematuria and proteinuria, the presence of decreased renal function and the type of renal pathology. The protocol varies with the disease and individualized treatment plans are developed according to the situation. Prognosis: The course of the disease tends to be long and slowly progressive. Those with long course, severe proteinuria, concomitant hypertension and glomerulosclerosis have poor prognosis. Prevention: Prevention of infection, avoidance of exertion, and removal of chronic foci of infection.