Analyzed result on observed data shows that runoff erosivity and sediment transport modulus have a good power function ( y = mxn ) relationship . all the correlation coefficients of regression equation are bigger than 0 . 9 in different watershed and power exponent b is 0 . 4 - 0 . 65 , which average is 0 . 52 . and n is bigger as harness degree high 實際流域的觀測資料分析結果表明:徑流侵蝕力與輸沙模數之間有很好的冪函數( y = mx ~ n )關系,回歸方程相關系數均在0 . 9以上,關系式中冪指數n在0 . 4 - 0 . 65之間,平均為0 . 52 ,治理度越高, n值越大,而參數m與流域面積和治理度有關, m值隨著流域面積的增大和治理度的提高而減小。