By time series analysis, the relationships between soil water potential and precipitation dynamic change on hillslope in the typical peak-cluster depression area of Huanjiang county in Guangxi Autonomous region have been analyzedfrom May to September in 2004, and the soil water potential was collected from 10 and 20 cm depths of the six kinds of land covers. The results show as follows:(1) with the soil character of hysteresis and retentivity with precipitation, shrubbery and hay-covered chesnut were both abundant in soil moisture storage, which of the two kinds were slightly influenced by the weather fluctuation; (2) the soil moisture content kept lower on the slope land cultivated, obviously changing with the precipitation fluctuation, yet has been adjusted to detain for long period with the help of cushaw of creeping vegetation;(3) grassland and cajanus both had great difference in depths with soil moisture content which instantaneously responded to precipitation, but the 20cm depth of the first land cover had a better moisture retention, so as to be good for the moisture compensation for the 10 cm; (4) at the age of sapling, chesnut field was nearly bare ground, its soil moisture dynamic change had little connection with vegetation, but mostly with meteorological factors, which induced the change between that of the kinds of shrubbery, hay-covered chesnut and that of the kinds of grassland, cajanus.