| In this paper, methods of a variety of site preparation reforestation which existed in the region were reviewed and analyzed. Based on the predecessors' results of rainfall runoff infiltration of slope, this paper summed up the mathematical models of transforming relationship of slope water and adopted the HYDRUS-2D finite element simulation software to simulate dynamically Two-dimensional movement of the soil water under the different sets of conditions, and compared the simulated data with the observed data. The results showed that: simulation of the dynamic changes of soil moisture in different slope through the HYDRUS-2D software was excellent in precision and accuracy. It is of a very important value to afterward study on the different factors influencing infiltration of surface water catchments runoff issues, such as rainfall conditions, rainfall intensity, rain-based, pre-soil moisture, slope-degree and slope-shape etc.By simulating the changes of soil moisture in 1°and 3°slope under the bare land and compacted slope on 15 days during the rainy season , the results show that: the dynamic changes of soil moisture during the rainy season are closely related to the changes of rainfall; the trends of changes of soil moisture at different depths are the same, but the range of changes is obviously different and changes of soil moisture in shallow layers are more than that of the deeper ones; the sequence is 10 cm> 20cm> 30cm> 40cm> 50cm, especially obviously in 3°slope. In addition, by contrasting the soil moisture of different slopes, it showed that: runoff of 3°slope is better than that of 1°slope; compacted slop is more conducive to runoff yield, but the effect is not very clear when the soil bulk density changes from 1.21g/cm3 to 1.90 g/cm3.
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