Abstract: The quantitative methods of rill morphology evolution were studied, which employs the indoor soil bin rainfall simulation experiment of two bulk density of loess soil (1.30 g/cm³, 1.05 g/cm³) under the rainfall intensities of 45 mm/h,87 mm/h and 127 mm/h with 20° slope gradient. In the research, the fractal dimension and topological parameters were respectively calculated by different methods. Besides, the parameter of slope geomorphologic comentropy for geomorphology was also applied. Then the sensitivity of the quantization parameters was analyzed. The results show that the fractal dimension as an integrity parameter was not provided sensitively for describing the maturity rill networks. But the slope geomorphologic comentropy was a sensitive method to express erosion degree, and the topological parameters could reflect the diversity of rill network structures with preferable sensitivity.