Abstract: In order to exploit and make full use of the daylight resource in the bullding,the daylight resource division in China is made by three-level indexes,and each level of the indexes is divided in three proximately equivalent intervals according to the magnitudes respectively.In this paper,the daylight resource of China is divided into 3 zones and subdivided into 13 regions and subregions.According to the indexes mentioned in this paper,the daylight division map is made and the distribution characteristics of the daylight illuminaaion are given.