In this paper, different mathematical models were used to quantitative assessment of temporal and spatial distribution of rainfall erosion force R based on geographic information systems, comparing the difference between the different algorithms, the results showed that rainfall erosion force by different algorithms are quite different, the calculation results of annual rainfall erosion force R sorted for Z> F>W>L model, while that of monthly results ordered as Z> W>L>F model. While carry out risk assessment of soil and water losses, should adjust measures to local conditions, it is very important to choose reasonable risk evaluation model for accurate prediction of regional soil erosion. Different algorithms has the different spatial distribution of rainfall erosion force R, high risk areas are mainly concentrated in the west and the south, however, low risk areas are mainly distributed in the north and east. These results can provide scientific basis for prevention and control of soil erosion.