Today, liberalism is considered the most influential school, which a large number of governments, especially western governments, follow. According to its worldview and doctrinal anthropology, liberalism means knowledge of the ends, knowledge of ought tos and ought not tos, and modus operand, which clearly exerts profound influence on orientating the work of an individual and government. In an attempt to recognize the position of human ethics in the foreign policy of liberalism, the present article touches on liberal anthropology, teleology, and methodology and reviews the main elements of liberal foreign policy, including: "racism", "utilitarianism", deceit", and "violence". In fact, these elements help us form an idea of the liberal rationality of foreign policy. According to liberalism, any act or effort which is not done within the framework of these elements is regarded unacceptable.