关键词: 效用, 幸福, 快乐, 偏好, 福利, 价值

Abstract: Ethics of utilitarianism has been confronting an actual difficulty all the time, this difficulty is a problem of making concrete standard at the time of measuring quantitatively utility. Early utilitarian used delight and happiness to stand for and measure utility, later used social value increased and welfare to indicate the substantial concept of utility, and now it uses mainly preference and its satisfaction to definite the essence of utility. This dissertation analyzes and summarizes the change and development of concept of utility in theory and practice, and makes new classification and analysis for them by the system of concepts of cognition, sentiments and wills of psychology.

Key words: Utility, happiness, delight, preference, welfare, value