每一門學科都有自己的研究範疇。天主教社會教義的範疇如何界定？本文以否定性層面開始，結束於問題的肯定，以便獲得確定的天主教社會教義的範疇認定。天主教社會教義不是一種意識形態，不是一種社會學，不是一種社會學說，她是一種神學理論，特別是一種倫理神學理論，一種對福音精神的詮釋，一種對人類的不斷關懷。

Every course has its own study category. How to define the category of Catholic Social Doctrine? This article starts from negative answer, ends at the affirmative answer, in order to obtain the category definition of Catholic Social Doctrine. Catholic Social Doctrine is not an ideology, nor sociology, nor a social theory. It is theology, especially a moral theology, an explanation of Gospel, a continuing concern for humanity.