The potential of rainwater resources utilization were calculated and compared using the empirical formula method and SCS-CN model method.The amount of surface rainwater resources through different methods were analyzed and contrasted monthly and seasonally to find time and spatial distribution of water resources.Result showed that the predicted amount of surface rainwater resources by the empirical formula method in wet years(P=25%),flat water years7 < m³,1.98X10⁷ < m³,1.22 X 10⁷ < m³and 2.14 X 10⁷ < m³,respectively.The predicted amounts by the model method in wet years,flat water years,dry years and average annual precipitation years were as follows:3.21 X 10⁷ < m³,2.16 X 10⁷ < m³,1.31 X 10⁷ < m³ and 2.50 X 10⁷ < m³,respectively.The calculated value of experience method's was less than that of the model method.The summer of July,surface rainwater utilization potential reached a maximum value of corresponding feature year.