Acute nephritis is a kidney disease caused by streptococcus or other bacterial infections, with hematuria, proteinuria, edema, hypertension, oliguria and azotemia as the main clinical manifestations. Acute nephritis can be cured, and the treatment is mainly symptomatic. Therefore, the indicators of acute nephritis to return to school are the disappearance of hematuria and edema, the return of blood pressure and creatinine to normal, and the absence of abnormalities in urinalysis, which can be returned to school. However, if acute nephritis has persistent high blood pressure, large amount of proteinuria and renal function damage, regular testing is needed to avoid leaving abnormal urine test, proteinuria, high blood pressure easily transformed into chronic nephritis, which leads to prolonged and difficult to cure and affects the prognosis. At the same time, if acute nephritis has repeated tonsil infections, it is necessary to actively carry out anti-infection treatment, and if necessary, tonsil surgery can be used to remove.