Each National Health System has to choose a combination of health and treatment programs, as the health policy to keep people healthy. As a result of shared resources, the more concentration on treatment, make health program weaker and so thegreater rate of prevalence of diseases and the more burden on treatment programs. At this situation, the problem of lack of ability to pay for health services and products will seriously threaten the health of society. Based on statistics of health status, Iran is going to face this state. So here at this thesis, in order to simulate and study the behaviors of key state variables during the time, the model of national health system developed by system...