China is located in the eastern part of the Eurasian continent in the northern hemisphere. It is mainly located in temperate and subtropical regions and has abundant solar energy resources. According to the long-term observations accumulated by more than 700 meteorological stations throughout the country, the total annual solar radiation in China is approximately 3.35×103–8.40×103 MJ/m2, with an average value of 5.86×103 MJ/m2. The contour line starts from the northeast of Inner Mongolia, west of Daxinganling, passes southwest of Beijing, faces south to Lanzhou in the west, then heads south to Kunming, and finally turns towards Hengduan Mountains in southern Tibet. In the vast area to the west and north of the isoline, except for a small total area of ​​4.46×103 MJ/m2 in the northern part of the Tianshan Mountains, the total amount of most of the remaining regions exceeds 5.86×103 MJ/m 2 . .
