“信”是中国伦理思想的一个重要范畴和概念。自先秦儒家以来,诸多思想家对“信”问题展开了探释,南宋哲学家朱熹(1130-1200)对“信”也有精辟见解。他不仅探讨了“信”与“诚”、“信”与“忠”的关系,分析了“信”的内涵,而且对“信”的伦理意义作了比较独到的阐发。一、“信”的基本内涵在朱熹道德观中,“信”是具有基础性地位的重要道德范畴之一。朱熹虽然常常将“信”与“诚”、“忠”连用为“诚信”、“忠 ”Letter “ is an important category and concept of Chinese ethics. Since the pre-Qin Confucianism, many thinkers have explored the issue of ”letter“. The Southern Song Dynasty philosopher Zhu Xi (1130-1200) also had an insightful view of ”letter“. He not only explores the relationship between ”letter “ and ”honesty “, ”letter “ and ”loyalty “, analyzes the connotation of ”letter Made a more unique analysis. First, “letter ” the basic connotation In Zhu Xi’s moral concept, “letter ” is one of the important areas of morality with a basic position. Although Zhu Xi often “letter ” and “honesty ”, “loyalty ” as “” integrity “, ” loyalty