[Purpose/significance] The construction of a knowledge organization system (KOS) relies on collective ne⁃gotiation among expert groups to obtain a conceptual system for specific domain knowledge organization needs, but it is difficult to cover the needs of multi domain resource organizations. With the development of diversified knowledge and the demand for solving complex problems, people have put forward requirements for the construction of diversified knowledge organization systems. Explores the theoretical basis of knowledge organization system construction from a di⁃versified perspective, can provide a reference theoretical basis for the construction and sustainable development of di⁃versified knowledge organization systems. [Method/process] This article mainly analyzes the reasons for the diversity of KOS from the two key elements that dominate the construction of KOS: the object (resource environment) and the sub⁃ject (cognitive subject); furthermore, the theoretical framework and fundamental for constructing a diversified knowl⁃edge organization system was explored, providing a reference theoretical basis for the construction and organic integra⁃tion of diversified knowledge organization systems. [Result/conclusion] Complex resource environments and personal⁃ized cognitive subject thinking are the main contributing factors to diversified KOS. Based on multiple theories such as literary warrant, ethics of care, epistemology, and cultural hospitality, the theoretical thinking on the construction and organic integration of diversified knowledge organization systems has been clarified, in order to enable KOS to adapt to the diverse changes and development needs of the social environment and promote its sustainable development.