Hepatitis B/C virus (HBV/HCV) infections are serious problems of world-wide, which cause over million die each year. Most of HBV/HCV patients need long term therapy. Side effects and virus mutations make difficult to determine the durations and endpoints of treatments. Medical images of livers provide evaluating tools for effectiveness of anti-virus treatments. This paper presents a liver hepatitis progression model. Each class C i in the model consists of three characteristic qualities: gray-scale characteristic interval I G, i , non-homogenous degree N h, i and entropy Entro i . This model aims to describe both digitally and visually a patient’s liver damage. Examples are given to explain how to use the liver hepatitis progress model to classify people with normal livers, healthy HBV carriers, light chronic HBV patients and chronic cirrhosis HBV patients. The results show that our analysis results are in agreement with the clinic diagnoses and provide quantitative and visual interpretations.