Short-course High-dose Prednisone and Dexamethasone in Children With ITP

Inclusion Criteria:Subjects enrolled in this study must meet all of the following criteria: 1. Meet the ITP diagnostic criteria, within 3 months of the first diagnosis 2. Age \> 28 days and ≤ 14 years old 3. Untreated PLT\<20×109/L, or PLT\<30×109/L after 1 week of intravenous gamma globulin (IVIG) treatment 4. Have signed the informed consent Exclusion Criteria:Anyone who has any of the following conditions will not enter the clinical study: 1. Intracranial hemorrhage or severe gastrointestinal or urinary tract hemorrhage requiring emergency treatment, such as simultaneous use of platelet transfusion and thrombopoietic drugs (recombinant human thrombopoietin, eltrombopag, etc.) 2. Received glucocorticoid therapy within 6 months 3. Menstrual female children 4. Patients with underlying diseases such as tumor diseases, autoimmune diseases or genetic diseases 5. Patients who have received radiotherapy and chemotherapy 6. There are contraindications to the use of glucocorticoids (hypertension, glaucoma, peptic ulcer, etc.) 7. There are any significant abnormal coexisting diseases or mental illnesses that affect the patient's life safety and compliance, and affect informed consent, research participation, follow-up or interpretation of results