Abstract: Rainfall erosivity is a fundamental factor for quantitative monitoring and assessment of soil erosion.So it is very important to find a convenient model of rainfall erosivity algorithms.Based on 392 individual rainfalls in 26 years of two areas,that is Lushan County in the Henan Province and Yanqing County in Beijing（municipality） respectively,R-value was calculated with EI₃₀.According to the EI₃₀ value,the new algorithms of R,proposed by Bu Zhaohong,was validated.Meanwhile,a review of other models was given.Results showed that discrepancy of the two models result was very small in the assessment of year R-value.It can be used not only in the two studied regions but also in others with high precision.Consistent evaluation criterion may be founded according to the model on the estimating yearly R-value in water erosion area in China.This is significant to realize the soil erosion monitoring and forecasting periodically and publish bulletin at a large scale.