Abstract： Henoch- schönlein purpura， a paediatric multiple difficult conditions， is an allergic disease dominated by systemic small vessel inflammation，and can progress to renal failure and other critical lesions if there is renal involvement. Traditional Chinese medicine(TCM) focuses on the concept of prevention before disease onset，prevention of disease from exacerbating， prevention of recurrence， so that pediatric Henoch- schönlein purpura has a relatively slow pathological process and easily involves the kidneys.The author excavates the source stream of TCM concepts for the treatment of undesired diseases，explicates the TCM concepts and clinical applications for the initial prevention and treatment of external sensations and prevention of disease transmission during the treatment of allergic purpura，the polar phase prevention and treatment of purpura trigger critical illness， the recovery phase cure and prevention and protection of the kidney， and the early prevention and treatment of renal involvement.