Abstract: In the framework of teleology,Aristotle justified the necessity of virtue by “Function Argument” on the basis of the nature of human being and its characteristic life.Contemporary Aristotelian ethics,following the route of “Function Argument”,justified the necessity of virtue for human well-being by studying human being’s characteristic mode of existence.Compared with modern moral philosophy,the justification of Aristotelian ethics has theoretical and practical significance in a way;nevertheless it also faces problems caused by operation mechanism of modern society.This justification,although has rationality for human being as a class,is less persuasive for human being as individual.

Key words: function argument, Aristotelian ethics, virtue, happiness