A Study to Evaluate the Antiviral Activity and Safety of HH-003 in Chronic Hepatitis B Subjects With Low-level Viremia

Inclusion Criteria: * Signed informed consent form; * Male or female aged from 18 to 60 years (inclusively); * 18 kg/m\^2≤BMI≤30 kg/m\^2, body weight≥50 kg for men and ≥45 kg for women; * Subjects who have chronic HBV infection greater than or equal to 6 months at screening; * 10 IU/mL≤HBsAg≤3000 IU/mL; HBV DNA≤2000 IU/mL; ALT≤3×ULN; * Subjects who have been on nucleoside reverse transcriptase inhibitors therapy for more than 1 year prior to screening. Exclusion Criteria: * Females who are pregnant or lactating at screening; * History of alcoholic liver disease, moderate fatty liver, autoimmune liver disease, other hereditary liver disease, drug-induced liver disease or other clinically significant chronic liver disease induced by non-HBV infection; * History of cirrhosis at any time prior to or at time of screening, or having progressive liver fibrosis at screening ; * History or evidence of hepatocellular carcinoma at any time prior to or at time of screening; * Exclusionary laboratory results at screening: total bilirubin \>2xULN or direct bilirubin \>1.5xULN，hemoglobin \<120 g/L for males or \<110 g/L ro females，platelets count\<100,000/mm\^3 (100×10\^9/L), and absolute neutrophils count \<1,500/mm\^3 (1.5×10\^9/L).