An open-label,prospective, randomized pilot study to evaluate the efficacy, safety and tolerability of paeoniflorin, for the treatment of autoimmune hepatitis (AIH) with mild necroinflammatory activity on liver biopsy.

Inclusion Criteria:

• Patients aged 20-70 years;
• Diagnosed with AIH or primary biliary cirrhosis-autoimmune hepatitis overlap syndrome based on liver biopsy results and without indication of immunosuppressive therapy;
• High levels of alanine aminotransferase (ALT) or aspartate aminotransferase (AST)(1-3 X ULN);
• High levels of IgG(1-1.5 X ULN);
• Liver biopsy showed mild lymphocytic piecemeal necrosis (interface hepatitis);
• Agreed to participate in the trial, and assigned informed consent.

Exclusion Criteria:

• The presence of hepatitis A, B, C, D, or E virus infection;
• Patients with presence of liver cirrhosis or portal hypertension;
• Patients with presence of fulminant liver failure;
• Primary sclerosing cholangitis, non-alcoholic steatohepatitis, drug induced liver disease or Wilson disease confirmed by liver biopsy;
• Pregnant and breeding women;
• Severe disorders of other vital organs, such as severe heart failure, cancer;
• Parenteral administration of blood or blood products within 6 months before screening;
• Recent treatment with drugs having known liver toxicity;
• Taken part in other clinic trials within 6 months before screening.