本文认为：李二曲的哲学思想主要反映在他的“灵原心体论”、“明体适用说”与“知行统一观”三个方面。“灵原”主要探究“人体本原”问题，“明体适用说”是由“灵原”本体论推之而出的，“知行统一观”则说明只有把二者统一起来才能达到认知的目的。 This paper argues that Li Erqu’s philosophical thinking is mainly reflected in his three aspects of “spiritual psychology of the original soul”, “application of the Ming style” and “unity of knowing and doing”. Lingyuan mainly explores the issue of “human primitiveness”. The theory of “adaptation of the Ming” is deduced from the “Lingyuan” ontology, and the “unity of knowledge and practice” shows that only by unifying the two can achieve the cognition the goal of.