There are four major functions of the social security system: social insurance nets, public assistance nets, social service nets, and social cooperation nets. All of these nets strive for improving human rights and dignity. Especially, both social insurance nets and public assistance nets are designed to secure Iiving standard and human rights. SociaI service nets and social cooperation nets are designed to improve living standard and human rights. Also, it is possible for this model to make us compare the welfare levels of nations currently running social security system.