In the Loess Plateau with high frequency and intensity of hard rain, the loss of water and soil is severe. This paper based on a large number of recording raingauge data in the last 30 years, the standard of hard rain in the region was discussed, the frequency and the ma-ximum value of hard rain were analysed; and nine kinds of basic rainfall models were obtai-ned. To adapt the general formula of rain intensity for various sites of the region, some modi-fication parameters were found by approximate diagram and regression analysis. The equation concerning the relationship between site and area, and the related curves between duration and depth of rain were obtained after analysing the small watersheds which were subjected to severe erosion in the gullies of highlands. The distribution of the mentioned characteristics of hard rains in the loess Plateau was also discussed.