Abstract: Based on analyses to the nationwide wind direction field, wind speed field and the population distribution, a site distribution method of the nationwide radiation environmental monitoring network was proposed, which includes monitoring sites distribution density and major distribution routes, and etc. Combining with the distribution of nuclear facilities, location arrangements of the sites in the overall nationwide layout was set forth, including annular distribution, special route distribution, nuclear power plant alpine defense distribution and radiological research institutes radial distribution. The distribution of automatic monitoring sites should be relatively dense in Shanxi, Sichuan, Yunnan, Guizhou, Hunan, Guangxi, Guangdong, Fujian, and Zhejiang province; and loose in Tibet, Xinjiang, Inner Mongolia, and Qinghai. With this site distribution method, the radiation environmental condition can be effectively monitored.

Key words: atmospheric radiation, environmental monitoring network, automatic monitoring stations, site distribution, wind field, ArcGIS