Purpura nephritis is the most serious complication of allergic purpura and one of the determinants of its prognosis. Children who have allergic purpura, especially those with recurrent skin purpura and prolonged disease, should insist on checking the urine sediment for 3-6 months regardless of the presence or absence of symptoms. If purpura nephritis has been diagnosed, it is important to decide whether hospitalization is needed according to the condition. In terms of regulation care, the following should also be noted: 1. Remove possible allergens. 2. Pay attention to rest and avoid mood swings and mental stimulation. Prevent insect bites. 3. Avoid strenuous exercise and reduce physical activity. 4, pay attention to keep warm and prevent colds. Control and prevent infection, use sensitive antibiotics when there is a clear infection or foci of infection, but avoid blind prophylactic use of antibiotics. Actively prevent and control infections, and avoid using drugs that have kidney damage. 5, pay attention to a light diet, as far as possible to avoid spicy, greasy such as raw onion, raw garlic, chili, beef and mutton, as well as food that may trigger allergies such as fish, shrimp and other foods; should also avoid drinks, snacks and other convenience foods. 6, low salt and low protein diet, with appropriate dietary therapy, can often give barley, yam, lotus root, lotus leaf, water chestnut and other foods with spleen or heat-clearing effect. 7.Urine examination should be performed at least once a week, and urine microalbumin and 24-hour urine protein quantification should be checked when necessary. 8.In order to prevent recurrence, it is often necessary to consolidate treatment for a period after the disease is cured.