Pegylated Interferon α in Previously Interferon-treated CHB（Leading Study）

Inclusion criteria

• Understand and sign the informed consent, participate in the study voluntarily.
• Aged between 18 and 65 (including 18 and 65).
• HBsAg positive for at least 6 months or other evidence suggests chronic hepatitis B.
• Had previously received interferon therapy, and discontinuation for at least 6 months at the time of enrollment, with a HBsAg level declined for at least 80% at the end of interferon treatment compared to the level of treatment started.
• HBsAg≤500 IU/mL at screening, and HBsAg rebound should not exceed 50% when compared to the HBsAg level of previously interferon treatment started.
• The pregnancy test within 24 hours previous to the first medication must be negative for women of childbearing. And all participants (male and female) should use effective contraception during the study period.

Exclusion criteria

• Pregnant or lactating women, or those who had a birth plan during the study period.
• Patients with neuropsychiatric disorders, especially depression, anxiety, mania, schizophrenia and other mental illness history or family history of mental illness.
• Patients with chronic liver disease caused by hepatitis A, hepatitis C, hepatitis E and/or HIV infection, or other causes (such as alcoholic hepatitis, drug-induced hepatitis, autoimmune liver disease, etc.).
• Evidence of acute severe liver damage: ALT\>10 ULN, or markedly elevated ALT with significantly elevated bilirubin.
• Evidence of uncompensated liver disease: ascites, esophageal and gastric varices rupture bleeding, sepsis, hepatic encephalopathy, hepatorenal syndrome, etc. Or previous evidence of decompensation of cirrhosis.
• Patients with evidence of hepatocellular carcinoma or AFP\>1 ULN.
• Kidney diseases: acute or chronic nephritis, renal insufficiency, nephrotic syndrome, etc. Or serum creatinine \>1 ULN at screening.
• Neutrophil count \<1.5×10\^9/L, platelet count \<90×10\^9/L, blood phosphorus \< 0.8 mmol /L.
• Autoimmune diseases (such as psoriasis, systemic erythematosus, etc.), endocrine system diseases (such as thyroid diseases, diabetes, etc.), hypertension (blood pressure ≥140/90 mmHg) poorly controlled by prescription drugs, serious history of heart disease (especially in the past 6 months), severe retinopathy or other serious eye diseases. Patients with organic disease or dysfunction of other vital organs.
• Patients who plan to receive organ transplant or have already undergone organ transplant.
• Patients who allergic to the investigational drug or any of its excipients, or who meet any contraindication declared in the instructions of the investigational drug.
• Other conditions that are considered inappropriate for enrollment by the investigator.