With the aim to understand the spatial distribution of soil moisture along slopes, the method of multi-electrode electrical resistivity tomography was used on two 400m length grass slopes of Diedie and Yunwu Mountains as study area. Both the two longitudinal transect lines were set up to detect the soil resistivity and water moisture by more points simultaneously and continuously. Results showed that there was a good statistical correlation between soil resistivity and moisture content on Yunwu Mountain (R2=0.78), and this suggested that it was feasible to determine the spatial variation of soil moisture through measuring spatial distribution of soil resistivity on slope. On Yunwu Mountain, the soil electrical resistivity gradually increased from the top slope to the mid slope, and then decreased to the bottom. While, on Diedie Mountain, it decreased from the top slope to bottom gradually; the light, mild and severe dry layers occurred in 1～3m, 3～4m and 6～17m soil layers on Yunwu Mountain respectively; While, on Diedie Mountain, the light and severe dry layers occurred in 3m, 6m and below 6m soil layers respectively.