Precipitation is the main driving force to induce soil erosion. By taking Ruyang County in the earth rocky mountainous area and Song County in the loess hill area as examples,the influences of the change of precipitation on soil erosion distribution under differentunderlying surface conditions (terrace,forestland,slope cultivated land,and abandoned slope) were studied. Soil erosion factors,such as rainfall intensity and slope,were observed and analyzed. A combined equation was derived to express the influence. Results showed thatthe water storage capacity of abandoned slope and slope cultivated land was lower and the water storage capacity of terrace and forestland was higher. So,terrace and forestland,as well as the supplementary gully managementengineerings,should be adopted as the importantmeasures of rainfall water storage through full argumentation.