道德定义是我国伦理学界长期争论而至今仍未解决的问题。对此本文进行了数学方面的思辨。认为要寻求一个统一的道德的定义,首先就必须要证明是否存在这样一个统一的道德定义。并针对伦理学中对概念下定义的不准确之处,从数学中采用“等价命题”给概念下定义的方法,提出了伦理学引入数学思想、方法的必要性。 The definition of morality is a long-standing controversy in our country’s ethics and has not yet been solved. In this paper, mathematical speculation. To think that to seek a unified definition of morality, we must first prove whether there is such a unified moral definition. In allusion to the inaccuracy of definition of concept in ethics, this paper introduces the concept of “equivalent proposition” from mathematics to define the concept, and puts forward the necessity of introducing mathematical thought and method into ethics.