自然区划的对象是自然综合体,按照地表自然综合体的相似性与差异性,划分为一系列的自然区。根据划分出来的区域来探讨自然综合体的特征及其发生、发展与分布的规律性,这就是综合自然区划的内容。因此在解决区划原则问题以后,制定一个合理的区划分级单位系统,是开展综合自然区划的首要工作。中国综合自然区划是采取单列系统方 The object of natural zoning is a natural complex, which is divided into a series of natural areas according to the similarities and differences of surface natural complexes. According to the divided areas to explore the characteristics of natural complexes and their occurrence, development and distribution of regularity, which is the content of integrated natural zoning. Therefore, after solving the zoning principle issue, the development of a reasonable district-level unit system is the primary task of carrying out comprehensive natural zoning. Integrated natural zoning in China is based on a single-row system