关键词: 自然权利, 功利主义, 社会正义, 伦理价值

Abstract: Any political theory has its specific value structure in order to offer ethical support for practical proposition, institutional structure and policy mechanism, and switches its connotation with the development of conditions of politics, economy and culture. There are several important phase in the development of the theory western political liberalism, such as phases of enlightenment, utilitarianism and modern liberalism. Natural rights, principle of utility and social justnice are separately asks of core values for different phases. Interpreting and analyzing the switch of ethical connotation of liberalism and the difficulties in theoretical and practical level, may offer a useful theoretical perspective for realizing the tendency of value and policy of western contemporary liberalism.

Key words: natural right, utilitarianism, social justice, ethical value