Abstract: Unifying the connotation of all categories of natural resources and building a unified classification system for natural resources are the prerequisites for achieving the unified management of natural resources. The authors in this research have adopted the literature review method to analyze the basic connotations of natural resources, list all the categories of identified natural resources, and systematically sort out the insufficiency of current natural resources classification systems. Besides, the authors have put forward the consummate suggestions for promoting the unified classification system for natural resources. The results show that the existing natural resources classification systems mainly have three problems, that is focusing on academic classification, defective classification systems, and the absence of comprehensive and systematic enumeration. Based on the challenges above, three suggestions have been put forward. Firstly, the holistic natural resources system should be built, which includes land, geological minerals, forest, grassland, marsh, water and sea. Secondly, the theoretical research on natural resources classification system should be enhanced. Thirdly, the natural resources classification system should be built facing the three dimensional investigation. This research could provide some references for the establishment of China’s natural resources classification system, which will serve the unified management of natural resources.