Its erosivity is usually estimated by the product of rain kinetic energy times the biggest rain density during a certain period,and also,can be determined by the daily rainfall amount.

Based on 49 single rainfall process data of Lushan county water and soil conversation station in Henan Province,the rainfall erosivity value was calculated using the RUSLE,CREAMS,Richardson and a revised daily rainfall amount model developed by GUO Xinbo respectively.

A rainfall erosivity model using daily rainfall amounts to estimate half-month rainfall erosivity directly was established from data of 71 weather stations in China.

Rainfall erosivity in Yan\'an area was estimated by the method of a simple model based on daily rainfall amounts using daily rainfall amounts data from 1951 to 2005 of Yan\'an weather stations.

The changes of daily maximum, minimum temperature and daily precipitation are the basis of evaluating the climate change impacts on various extreme events in a CO2 doubling environment.

The article analyzed the seasonal and annual distribution of rainfall erosivity using the data of rainfall collected in Small Cucumber Park Soil and Water Conservation Monitoring Station of Yuanmou County since the 1990s,and established a preliminary prediction model based on the daily rainfall erosion.

With the daily rainfall data of ten meteorological sites in Liaohe River Basin,we estimated the rainfall erosivity and analyzed the spatial and temporal variability in the Liaohe River Basin by using the daily rainfall erosivity model.