Allergic purpura mostly occurs in children aged 3 to 14 years old, mostly caused by viruses and other pathogenic bacteria that cause autoimmune dysfunction and then induced by dust mites, pollen, seafood, chemicals, etc. In addition, the onset factor is also related to the season and the food of that season. Therefore, clinically, we found that many children have a history of cold and flu before the onset of the disease and go out on spring trips, and most of them occur in spring and summer. The repeated attacks of allergic purpura will gradually accumulate other organs, especially the kidneys, so the children should be diagnosed and treated as early as possible. With the continuous progress of medical technology and environment, it is not difficult to diagnose allergic purpura. The first is to follow the doctor’s advice and use the medication, the other is the care and attention during the treatment, which is also one of the key factors to prevent recurrence. (1) Pay attention to weather changes, avoid cold and flu, avoid going to places where people gather to prevent infection; (2) Pay attention to rest, avoid strain and sports activities; (3) Avoid contact with pets. (3) Avoid contact with pets. Do not vaccinate for one year; (4) Eat a diet free of animal protein, avoid meat, eggs, milk, fish and shrimp and other animal protein intake. Avoid animal protein intake such as meat, eggs, milk, fish and shrimp, etc. You should eat easily digestible food, no raw and cold food, no snacks and drinks. After the disease stabilizes, gradually increase and resume normal diet under the guidance of physician. (1) Children taking hormones should have their blood pressure monitored. The dosage of hormones should not be reduced or stopped on your own, but should be adjusted under the guidance of the physician. (3) Allergic purpura is an autoimmune disease with multiple organ involvement and a recurrent course, the cause of which is related to infection, diet and environment.