With the method of Detrended Canonical Correspondence Analysis(DCCA),we studied the relationship between the types of spatial and temporal variation of soil moisture content and the environmental factors at the scale of catchment.Results indicated that in a wetter year(1998),the profile distribution of soil moisture content shows three types:decreasing type,waving type and increasing type contributed to the influencing of land use and topography.Under the influencing of precipitation and topography.soi...