The purpose of this study is to evaluate the therapeutic efficacy of allogenic bone marrow stem cells (BMSCs) transplantation in patients with liver failure caused by hepatitis B infection. The evaluation of the efficacy includes the level of serum alanine aminotransferase (ALT), aspartate aminotransferase(AST), total bilirubin (TB),prothrombin time (PT), albumin (ALB), prealbumin(PA), liver histological improvement before and 1 week to 1 year after transplantation. Child-Pugh scores, MELD scores and clinical symptoms were also observed simultaneously.

Inclusion Criteria:

• Aged 16~65 years.
• Serum HBsAg positive for over six months.
• Meet the diagnostic criteria of liver failure:

Exclusion Criteria:

• History of moderate to severe hepatic encephalopathy or variceal bleeding during the last two months before enrolment.
• Prothrombin time is over 30s.
• Cirrhosis caused by other reasons except HBV infection.
• Severe problems in other vital organs(e.g.the heart,renal or lungs).
• Liver tumor on ultrasonography, CT or MRI examination.
• Pregnant or lactating women.
• Imaging evidences of vascular thromboses.