The aim of the trial is to study the efficacy and safety of treatment with BDB-001 Injection substitution of glucocorticoid in patients with ANCA-associated vasculitis.

Inclusion Criteria:

• 18 years old≤Age≤75 years old, male or female;
• Diagnosis of granulomatosis with polyangiitis(GPA) or microscopic polyangiitis(MPA)；
• Newly diagnosed or relapsed GPA or MPA that requires treatment with cyclophosphamide(CYC) and glucocorticoids(GCs)；
• Positive test for anti-proteinase 3(PR3) or anti-myeloperoxidase (MPO)；
• Estimated glomerular filtration rate ≥15 mL/minute/1.73 m^2；
• At least 1 major item, or at least 3 non-major items, or at least the 2 renal items on BVAS；

Exclusion Criteria:

• Active tuberculosis infection;
• Severe disease as determined by rapidly progressive glomerulonephritis, alveolar hemorrhage requiring pulmonary ventilation support, rapid-onset mononeuritis multiplex or central nervous system involvement；
• Any other known multi-system autoimmune disease including eosinophilic granulomatosis with polyangiitis (Churg-Strauss), systemic lupus erythematosus, IgA vasculitis (Henoch-Schönlein), rheumatoid vasculitis,anti-glomerular basement membrane disease, or cryoglobulinemic vasculitis；
• HBsAg positive,or HBcAb positive and HBV-DNA positive；
• Received CYC within 3 months before the first administration or Received rituximab(RTX) within 12 months before the first administration；
• Received glucocorticoid shock therapy within 4 weeks before the first administration；
• Received an oral daily dose of a GC of > 10 mg prednisone-equivalent for more than 6 weeks continuously before the first administration；
• Received a anti-tumor necrosis factor and other biological agents treatment within 12 weeks before the first administration；
• Received Continuous dialysis treatment for 12 weeks or more before the first administration; Received Dialysis within 1 week before the first administration;
• Received intravenous immunoglobulin (Ig) or plasma exchange within 4 weeks before the first administration;
• Pregnant or lactating.