The rainfall erosivity can suggest the potential effect of rainfall on soil erosion. It is necessary to develop the water erosion model. The models used in CREAMS for calculating erosivity from daily rainfall data were tested at two locations that lie at Miyun and Puwa, in Beijing mountain areas. The results suggest that the difference of the model efficiency of equation in CREAMS did not vary significantly between sites at Beijing mountain areas. The model efficiency of the equation in CREAMS was 0.804 at Miyun, and 0.690 at Puwa. So the equation for calculating the rainfall erosivity in CREAMS should be used in Beijing mountain areas when the continuous record of rainfall are lack.