The goal of this clinical trial is to compare Leflunomide in Idiopathic pulmonary hemosiderosis. The main questions it aims to answer are: * The efficacy and safety of Leflunomide in Idiopathic pulmonary hemosiderosis * The mechanism of leflunomide in treating Idiopathic pulmonary hemosiderosis Participants will be treated with leflunomide plus stroid. A comparison group: Researchers will compare the control group treated with stroid to see if the efficacy of Leflunomide would be better than control group.
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Times of pulmonary hemorrhage
Timeframe: 12 months