This paper calculated the total radiation in clearsky Q₀ by multivariate regression equa-tion and trend insertion and compile the annual and monthly distribution of total radiation map by computer automatically.According to process and analysis of the data covering a period of 560 meteorological stations over China in 10-22 years up to 1978 and the distribution map, it indicates that the total radiation not only related to the latitude and the variation of solar declination, but also to the altitude and humidity, which are the main affected factors too. In summer half year in eastern part, the humidity is the main affected factor, while the altitude is the main factor in western part. In winter half year, the latitude is main factor affected the most parts of China. Due to the interaction and the affected extent of different time, the differentia-tions of monthly distribution of total rediation in China were obvious.