9).Renal pathology revealed 3 patients with class Ⅳ, 1 patient with class Ⅱ. Image results showed diffuse pulmonary infiltration lesions. Bronchial lavage fluid was hemorrhage. Three patients recovered after treatment with corticosteroid and intravenous cyclophosphamide therapy. Conclusions Diffuse alveolar hemorrhage is rare serious complications of lupus nephritis. Aggressive immunosuppressive therapy should be started early for a favorable outcome.