Evaluate The Efficacy, Safety, Pharmacokinetics And Pharmacodynamics Of EVER001

Inclusion Criteria: 1. Having clinical diagnosis of primary membranous nephropathy, as verified by biopsy. 2. Have positive anti-PLA2R autoantibody test results \> 20 relative units (RU)/ml. 3. During screening at least one testing of proteinuria must be \>3.5 g/24h. 4. Have nephrotic range proteinuria for at least 8 weeks prior to Day 1 and no improvement (\<50% reduction) despite supportive therapy of ACE inhibitor or ARB unless contraindicated, for patients who have two tests of proteinuria during screening ≥8.0g/24h, the duration of nephrotic range proteinuria for at least 8 weeks is not required. Exclusion Criteria: 1. Non-primary membranous nephropathy or other condition affecting the kidney. 2. eGFR at screening \< 45 mL/min/1.73m2 or kidney function not stable . 3. Uncontrolled hypertension . 4. Serum albumin level at screening # 25g/l. 5. Have received: B-cell targeted therapy except rituximab at any time;Rituximab and the biosimilars within 2 years (participants with rituximab treatment between 1 and 2 years prior to Day 1 are eligible if there is documented evidence of B-cell repopulation to \>90% of Lower Limits of Normal Range.); Cyclophosphamide or Chlorambucil within 180 days;other immunosuppressive/immunomodulatory agents within 90 days;greater than 30mg/day prednisone or equivalence within 30 days. 6. Acute or chronic infection,including positivity of tuberculosis infection test. 7. Positive serology for TP,HIV, HBV, or HCV. 8. Lab testing abnormality as: WBC\< 3000/mm³, Lymphocyte \< 1000/ mm³, neutrophil \<1500/mm³, Hb \< 80g/L, Platelet count \<100×10e9/ L, Prothrombin time\>1.5×ULN, Activated partial thromboplastin time ≥1.5×ULN, Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) ≥ 1.5×ULN, alkaline phosphatase and bilirubin \>1.5×ULN. 9. Judged by the investigator that the participant is unlikely to comply with study procedures, restrictions, and requirements.