Abstract：Rainfall is a principal factor that causes soil erosion.In order to take prevention measures of erosion timely,analysis on the temporal characteristics of rainfall erosivity of Datong City is conducted by using Richardson rainfall erosivity method,climate tendency coefficient,precipitation concentration index and cumulative percent analysis method.The result shows that annual rainfall erosivity fluctuates periodically;Rainfall erosivity every ten years of Datong urban region tends to increase by 21.8?MJ·mm·hm-2·h-1,and that of other counties tends to decrease to different degrees;Rainfall erosivity of Datong City concentrates in June,July,August and September and the concentration index is between 20.85-23.67,which is larger than 8.3 at which the rainfall erosivity distributes evenly.
2006, Vol. 4 
