The majority of purpura nephritis (HSPN) has a good prognosis and most of them can be cured. The prognosis of HSPN depends on the following factors: First, age: the prognosis of children with purpura nephritis is better, except for a very small number of patients who die in the acute phase of acute nephritis, and 2% to 15% of those who develop end-stage renal disease, and those who develop end-stage renal often have a history of delayed and slow progression after the acute phase; patients with purpura nephritis starting in adulthood The prognosis is relatively poor. Clinical manifestations: Patients with purpura nephritis presenting with massive proteinuria and hypertension have a poor prognosis; especially those with unremarkable results from conventional treatment and those with early renal impairment. Renal pathological changes: the more severe the renal pathological changes, the greater the possibility of progression to chronic renal insufficiency. It is worth noting that some children with acute kidney involvement is not obvious or had normal urinalysis, but then hypertension and renal dysfunction occurred, and girls also have adult pregnancy prone to hypertension and proteinuria. Therefore, children with allergic purpura should have their urine routine reviewed regularly.