[Objective] The objective of this study is to analyze the impacts of contour reverse-slope on the spatial distribution of soil moisture in sloping farmland during rain season serious in order to provide theoretical basis for the improvement of the contour reverse-slope in water source area of Songhuaba reservoir in Kunming City. [Methods] We set up contour reverse-slope in the sloping farmland in Yizhe valley, and observed the soil moisture content at different soil depth in different positions of slope during different periods. [Results] Soil moisture content in contour reverse-slope maintained at stable level after 2 rainy days. At the upper reverse-slope, it reduced by 2.71%. In contrast, soil moisture changed greatly in different positions of slope. Soil moisture at upslope reduced by 9.04%, while at the middle slope, reduced by 10.41%. [Conclusion] Contour reverse-slope can retain soil surface runoff and moisture, and influence the distribution of soil moister in 20—40 cm depths of soil layer.