A dynamic model of hepatitis B virus with delayed immune response was investigated.Cytotoxic T lymphocyte immune response of infected cells was considered.By using linear characteristic equation analysis
it is proved that if basic reproductive ratio of the virus is less than one
the infection-free equilibrium is locally asymptotically stable.By using the iterative methods
the globally stable conditions of the positive equilibrium were obtained.Numerical results show that if basic reproductive ratio is 3.274 9