The functionality of human beings remains a main argument in Aristotle’s ethics system, which runs through his demonstration of such important principles of good people as happiness, virtue, human kindness, etc. So it’s called ontological ethics, but this pattern may face the dilemma that “being” and “ought to” can not be unified. Aristotle’s definition of the good is not only in the sense of value, but also contains a factual significance; therefore the ultimate goodness not only represents a value orientation, but also functions as a destination towards excellence in human nature. Unlike instrumental rationality in modern times, Aristotle’s ethics remains a complete system, which goes far beyond the relativism ethics.